Malicious PDF — malware analysis report

Static analysis result for SHA-256 123f45a994237a54…

MALICIOUS

PDF

59.3 KB Created: 2021-04-10 08:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02ec6e033465456d5ad747a272e56024 SHA-1: 810516b68d9ced0f1df306920855cb18398db849 SHA-256: 123f45a994237a54d60d774549354a800dc32c33c8deccb3a518ae84793cd03c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or scam attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the detection suggests it's likely designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6421

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=cscc+esl+placement+test+practice
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    • https://s3.amazonaws.com/widofafane/tell_me_about_yourself_sample_answer.pdf
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    • https://uploads.strikinglycdn.com/files/99d31dad-38a8-4701-a446-2be2e9da0d3e/molasomalovowusigoju.pdf
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