Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cc8685b135e5f0…

MALICIOUS

PDF

37.3 KB Created: 2021-09-25 08:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 487a19988be5d52a9bdd0e33bcb69bac SHA-1: 64f4f11de2781f067e9f4e7615be0b2576b89381 SHA-256: a9cc8685b135e5f0fc05b6d07bbde67c94e69ce2921eaf20c4ae2ecd2c3a63e9
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as a malicious phishing lure due to its small size, image-only content, and embedded clickable link. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the use of multiple distinct hosts for hosting the malicious PDF, suggesting an attempt to evade detection and distribute the payload widely. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6667

Heuristics 5

  • 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 37 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.
  • 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 http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/vedilezewaxubokuzejiv.pdf In PDF document text
    • https://bem-sa.com/img/file/betejidubutuvekomasi.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/14517617350.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7cf40dc3f---65435956655.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/giwudut.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/wifipekimag.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/66880221986.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/98705891541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=descendants+1+in+english+full+moviePDF link annotation

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