Malicious PDF — malware analysis report

Static analysis result for SHA-256 534c77b868b2d8d1…

MALICIOUS

PDF

37.3 KB Created: 2021-06-28 08:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c0e17d7f68759738aaa126b4461d4091 SHA-1: 83d5668a422a6900d782cb5dfb921abb17ed5a21 SHA-256: 534c77b868b2d8d10825b5a9e43136836366b372417812977f19ed4880927767
144 Risk Score

Malware Insights

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

The PDF is identified as an image-only lure, typical for phishing or malware distribution. It contains multiple embedded URLs, with one specifically noted as a link farm on disposable hosting. The ClamAV detection and ML classifier further support its malicious nature, indicating it likely serves as a dropper or redirects to a malicious site.

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://marathon-gexin.com/Uploadfiles/files/genafirasopup.pdf In PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/142111242260d8f27e6c473.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/25242865303.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/3e39a324f19c3ad52406d37cae711648/74462050670.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/18/file/genovosi.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/34225188703.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/87787560738.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/73645838704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+change+word+doc+to+pdf+in+windows+10PDF link annotation

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

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