Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9bdd9510a46a9b…

MALICIOUS

PDF

42.2 KB Created: 2021-04-09 19:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 021a3447af5a77a9ecae9791eccbf142 SHA-1: 4ec39e8944720777ee9f3e647460519c2f628790 SHA-256: de9bdd9510a46a9bff13b79deb35d0f8cd72385592a99f8f1686d05f44914b20
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier. It employs an image-only lure, a common phishing tactic, to obscure a malicious redirector link. The primary IOC is the URL 'https://yafferge.ru/strik?utm_term=the+pigman+all+characters', which is flagged as a known malicious redirector. The document's structure and embedded links suggest it is part of a link farm designed to distribute malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8204

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 42 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/strik?utm_term=the+pigman+all+characters
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