Malicious PDF — malware analysis report

Static analysis result for SHA-256 01221e13fa674459…

MALICIOUS

PDF

48.0 KB Created: 2021-04-09 06:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c2d5a1ff8915b2b6fdd889aa023a8edb SHA-1: cf74f9a0afcbdb7df892371247874368be96af03 SHA-256: 01221e13fa6744590bf611df460f0e80cfb8949b60f5a3c93174807f699eb37f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded URLs and a document body that poses a question to entice users to click on a link. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, and the ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack vector appears to be directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6039

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=what+is+the+number+555+divisible+by PDF link annotation
    • https://cdn.sqhk.co/wuvukidovime/ihlvBgg/bezubuxumij.pdfIn PDF document text
    • http://sawotawigusewon.22web.org/lifama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456166/normal_60391ecf69c34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446511/normal_6054f3f52bd7a.pdfIn PDF document text
    • http://vajamerafimal.iblogger.org/free_online_historical_fiction_short_stories.pdfIn PDF document text
    • http://fruit-ita.fun/nerifopegeziviv4iscb.pdfIn PDF document text
    • http://xitnet.fun/what_is_optimal_level_in_nutritionpa7rz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ece01ccd-9915-414a-a3ac-06a32dc8b5db/garexanelibifegewonivi.pdfIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_8f854dd4ec6c4f019bf439c9e91b5c47.pdf?index=trueIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_ed6c1faeb2964ba79b03255cfb55b61e.pdf?index=trueIn PDF document text

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