Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2a1ab0f65d567e…

MALICIOUS

PDF

50.3 KB Created: 2021-03-28 02:03:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 243c5070a6765777d99965b50fa20d2d SHA-1: 0baf11d86c2281d8dd678cfab8ca581e66bac092 SHA-256: 7e2a1ab0f65d567e134bfa76feac2bfc6a7929229f73dac6eb497f2095d32487
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure due to its image-heavy nature and embedded external links. The primary lure appears to be a disguised link to 'https://baarspo.ru/award?keyword=cambridge+primary+mathematics+learner+s+book+5+pdf', which is likely intended to lead to a malicious site or download. The presence of a large number of linked PDFs suggests an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9328

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 50 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://baarspo.ru/award?keyword=cambridge+primary+mathematics+learner+s+book+5+pdf
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