Skip to content
cccskills
FreePublished on GitHub

analyzing-malicious-url-with-urlscan

Investigate suspicious URLs with URLScan.io by reviewing screenshots, redirects, page content, and network requests. Extract domains, IP addresses, and file hashes as indicators of compromise, then compare findings with threat intelligence sources.

OriginalShow the original description

URLScan.io is a free service for scanning and analyzing suspicious URLs. It captures screenshots, DOM content, HTTP transactions, JavaScript behavior, and network connections of web pages in an isolat

Run score Not tested

See how to install

Good for

  • Investigating suspicious links in emails
  • Checking pages for brand impersonation and credential forms
  • Tracing redirects and extracting domains, IPs, and hashes
  • Comparing scan findings with threat intelligence sources

Files included (8)

  • SKILL.md4.0 KB
  • assets/template.md1.6 KB
  • LICENSE11.0 KB
  • references/api-reference.md1.5 KB
  • references/standards.md1.8 KB
  • references/workflows.md2.3 KB
  • scripts/agent.py6.2 KB
  • scripts/process.py15.3 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

Analyzing Malicious URL with URLScan

Overview

URLScan.io is a free service for scanning and analyzing suspicious URLs. It captures screenshots, DOM content, HTTP transactions, JavaScript behavior, and network connections of web pages in an isolated environment. This skill covers using URLScan's web interface and API to investigate phishing URLs, credential harvesting pages, and malicious redirects without exposing the analyst's system to risk.

When to Use

  • When investigating security incidents that require analyzing malicious url with urlscan
  • When building detection rules or threat hunting queries for this domain
  • When SOC analysts need structured procedures for this analysis type
  • When validating security monitoring coverage for related attack techniques

Prerequisites

  • URLScan.io account (free tier available, API key for automation)
  • Python 3.8+ with requests library
  • Understanding of HTTP protocols and web technologies
  • Familiarity with phishing URL patterns

Key Concepts

URLScan Capabilities

  1. Safe browsing: Renders URLs in isolated Chromium instance
  2. Screenshot capture: Visual snapshot of the rendered page
  3. DOM analysis: Full HTML content after JavaScript execution
  4. Network log: All HTTP requests made by the page (HAR format)
  5. Certificate analysis: SSL/TLS certificate details
  6. Technology detection: Identifies web frameworks and libraries
  7. IP/ASN mapping: Infrastructure intelligence
  8. Verdict: Community and automated classification

Phishing URL Red Flags

  • Newly registered domains (< 30 days)
  • Free hosting services (Wix, GitHub Pages, Firebase)
  • URL shorteners hiding final destination
  • Excessive subdomain depth (login.microsoft.com.evil.com)
  • Brand name in subdomain or path, not domain
  • Non-standard ports
  • Data URIs or base64-encoded content
  • JavaScript-heavy pages with minimal HTML

Workflow

Step 1: Submit URL to URLScan

Web: Navigate to https://urlscan.io and submit the suspicious URL
API: POST https://urlscan.io/api/v1/scan/
     Header: API-Key: your-api-key
     Body: {"url": "https://suspicious-url.com", "visibility": "private"}

Step 2: Analyze Results

  • Review screenshot for brand impersonation
  • Check redirects and final destination URL
  • Examine DOM for credential input forms
  • Review network requests for data exfiltration endpoints
  • Check SSL certificate validity and issuer

Step 3: Extract IOCs

  • Domains and IPs contacted
  • URLs in redirect chain
  • SHA-256 hashes of page resources
  • JavaScript file hashes

Step 4: Cross-Reference with Threat Intelligence

Use the scripts/process.py to automate URL scanning, extract IOCs, and cross-reference with VirusTotal, PhishTank, and Google Safe Browsing.

Tools & Resources

Validation

  • Successfully scan a suspicious URL via API
  • Extract screenshot and identify brand impersonation
  • Document complete redirect chain
  • Generate IOC list from scan results
  • Cross-reference findings with at least 2 threat intelligence sources

Reviews

No reviews yet. Tell others what you thought.

Comments

No login needed. Share how it worked for you, ask a question, or note where it did not run.

No comments yet. Be the first to write one.

Comments are published right away. Do not include personal information such as email addresses or phone numbers. Up to 2 URLs.

0 / 1,000 characters

This form is protected by reCAPTCHA, and the Google Privacy Policy and Terms of Service apply.

More skills from this repository

Assess exposure of Windows secrets protected by DPAPI, the operating system’s data protection service, during authorized security tests. Guide examination and decryption of saved credentials and browser data using available user sessions, credentials, or backup keys.

  • Assessing saved credential exposure in authorized tests
  • Examining collected DPAPI files offline
  • Reviewing protected browser and RDP credentials
mukul975/Anthropic-Cybersecurity-Skills34.9KUpdated Aug 31, 2026

Assess Shadow Credentials account takeover during authorized Active Directory testing. Examine permissions that allow public key registration, validate authentication without a password reset, and document credential cleanup, detection opportunities, and access control changes needed for remediation.

  • Assessing risky permissions identified in BloodHound
  • Validating account takeover without resetting a password
  • Generating directory change records during security exercises
mukul975/Anthropic-Cybersecurity-Skills34.9KUpdated Aug 31, 2026

Prepare for CMMC Level 2, a cybersecurity certification for defense contractors. Define the systems handling controlled information, review security requirements, calculate the SPRS assessment score, and organize remediation plans and evidence into a readiness report.

  • Define the assessment scope for systems handling controlled information
  • Calculate an SPRS score and prioritize unmet security requirements
  • Prepare security plans, remediation milestones, and assessment evidence
mukul975/Anthropic-Cybersecurity-Skills34.9KUpdated Aug 31, 2026

Create disk images for investigations using dd or dcfldd on Linux. The workflow covers write protection, bit-for-bit copying, hash checks to verify integrity, and documentation of the acquisition process.

  • Preserving a suspect drive before investigation
  • Creating evidence copies of USB devices or memory cards
  • Verifying that a disk image matches its source
mukul975/Anthropic-Cybersecurity-Skills34.9KUpdated Aug 31, 2026

Review Active Directory permissions with ldap3, a Python library for directory queries. Identify excessive access granted to non-administrative accounts, explain potential privilege escalation paths, and produce a JSON report with affected objects and remediation recommendations.

  • Auditing excessive Active Directory permissions
  • Investigating privilege escalation paths from ordinary accounts
  • Reporting affected objects and permission remediation recommendations
mukul975/Anthropic-Cybersecurity-Skills34.9KUpdated Aug 31, 2026

Inspect suspicious Android APK files without running them. Analyze permissions, app components, suspicious code patterns, and network indicators, then produce a JSON risk report to support malware triage and detection rule development.

  • Triage suspicious APK files without running them
  • Inspect dangerous permission combinations and suspicious API calls
  • Extract network indicators for malware detection rules
mukul975/Anthropic-Cybersecurity-Skills34.9KUpdated Aug 31, 2026

See all skills by mukul975

Report a problem with this skill