Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4570fef2ecdb9b4…

MALICIOUS

PDF

101.3 KB Created: 2021-04-01 09:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: eb22c190949e7ce6cb0a8cf9bd8e9554 SHA-1: 4d26b02d2d31da76626e5bff38ddaa77a2915b10 SHA-256: e4570fef2ecdb9b433ef01a0d3a86583d2be6b6684f09ed3e7bb649d9fc060c3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing or malware distribution lure, indicated by numerous embedded URLs pointing to disposable domains and link farms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content or visiting malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing campaign aiming to exploit SEO for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7693

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jacksth.ru/award?keyword=all+in+one+social+science+class+10+pdf+free+download PDF link annotation
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    • https://uploads.strikinglycdn.com/files/5788798f-12c1-4618-8cf6-5835d8a28f0c/teatro_en_casa_5.1_canales_rca_rt2781be_200_watts.pdfIn PDF document text

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