Malicious PDF — malware analysis report

Static analysis result for SHA-256 db73f3669b6a0a66…

MALICIOUS

PDF

66.5 KB Created: 2021-03-15 21:53:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 232fa7c7519b19f192014e2e25bf440a SHA-1: 8a47f81de8b3163b1b4f7e1ae485033750eae765 SHA-256: db73f3669b6a0a66e1de75530cef2df9ac79a09773c08425ea76adb4d4dd3e0b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with one prominent URL suggesting a lure for a book download. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous distinct links, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's prediction strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6626

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://xezojetit.ru/aws?utm_term=the+wave+todd+strasser+full+book+pdf PDF link annotation
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    • http://stakingyfi.com/fedukarojejujukon118jn.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/vunutitazatagozib.pdfIn PDF document text
    • https://xidiziwuzubiwon.weebly.com/uploads/1/3/4/6/134653180/zejosegarukag.pdfIn PDF document text
    • http://sfhgfje5df.xyz/cortisone_shot_in_knee_leg_pain6hvce.pdfIn PDF document text
    • http://triple-doska1.club/kitchenaid_mixer_ksm150_repair_manualtur2i.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/living_with_the_himalayan_masters_tamil.pdfIn PDF document text
    • https://rikutokamalaru.weebly.com/uploads/1/3/4/3/134319242/e93f32055fcc9.pdfIn PDF document text
    • https://rababavuve.weebly.com/uploads/1/3/1/8/131871532/wedez.pdfIn PDF document text
    • http://widifusi.myartsonline.com/15659526593.pdfIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_bdebf0de01c7440b9c2ea194ca0d15ed.pdf?index=trueIn PDF document text
    • http://dipuvomefig.epizy.com/11771121800.pdfIn PDF document text
    • https://a96990da-dd17-4b11-844c-aba2d588d1b6.filesusr.com/ugd/5e5e7b_ec7eea5e159b4f4da85457653bde1743.pdf?index=trueIn PDF document text
    • http://jipizizesotexo.rf.gd/12663823086.pdfIn PDF document text
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    • http://figofubinodafe.rf.gd/learn_korean_fast_free.pdfIn PDF document text
    • http://vuwepowav.epizy.com/24483912849.pdfIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_03ccb177cdb249609b2a4c62c4ade652.pdf?index=trueIn PDF document text