Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3dc13d378007c4…

MALICIOUS

PDF

38.0 KB Created: 2021-03-18 13:51:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 85e13fc5a190ced06afb8387a87cd626 SHA-1: aed798933c0520089b17aa9c01253fce4ec8cc37 SHA-256: cd3dc13d378007c41c064677bc15846713d7460ea57aacd22c729016e93e67d2
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6992

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 38 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 https://botokaw.ru/award?keyword=beginner+english+short+stories+pdf PDF link annotation
    • http://shoop-fr.ru/vixotokoxefotiwelusevug1qnz9.pdfIn PDF document text
    • http://ygrash.website/78286462610wac68.pdfIn PDF document text
    • https://dananiruw.weebly.com/uploads/1/3/2/7/132741593/vapafekudapowogarim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411691/normal_5ff5b5f84ce13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477649/normal_604f40382fd22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378404/normal_5ffe1fb733193.pdfIn PDF document text
    • http://24goodstore.site/19280229149h0lvx.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/apache_kafka_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/basic_calculus_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/33607015258.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_11b5534a6b54425da0f260f16819fffb.pdf?index=trueIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_32751458820c43c081096a1e6fc2df89.pdf?index=trueIn PDF document text

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