Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4f803ad9ee5836…

MALICIOUS

PDF

70.6 KB Created: 2021-04-30 11:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6eb26d7453bba4373d28f10e29e9024 SHA-1: c858467c8b96a565ce9aabfd2a3507c105ac206a SHA-256: 3a4f803ad9ee5836d70351e24b2e2d91e09cc4bd8388f5d863231bdee4317875
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document body contains a misleading title about vehicle oil, which is likely a lure to direct the user to external URLs. Several of these URLs are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9596

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=using+20w50+instead+of+5w30
    • http://springital.fun/gololimus23mf.pdf
    • http://wildber.store/linfoma_de_burkitt_y_vihnx5it.pdf
    • http://idealicaufficiale.website/guideline_tb_2018i306k.pdf
    • http://kyponnik.online/person_tracker_toolkit_2017_appb0et9.pdf
    • http://rejorevubirobu.sportsontheweb.net/xapidowikobarila.pdf
    • http://vulufinagi.mypressonline.com/51652083566.pdf
    • http://ch-bewertung-2888.xyz/280654920699k24p.pdf
    • http://retapadu.medianewsonline.com/alcon_rebate_2020.pdf
    • http://blockhcain.host/31466367538kj0q3.pdf
    • http://navaram.online/fakapezud99ue.pdf
    • http://prizinsta365.website/komijekifurapukadusarivoggs45w.pdf
    • http://blankid.ru/mogadeduxawumow4cgt8.pdf
    • http://bonboxstudio.com/jififomapalikivepijuybc0e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zepifudoxapo/43435734574.pdf
    • https://8d537faf-e869-4ed9-a29f-988560fab1dc.filesusr.com/ugd/0cce51_fb5370e24beb414d81a2f0501f00e289.pdf?index=true
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_d943fbcef09e4933a2cd99af3eb07131.pdf?index=true
    • https://s3.amazonaws.com/lekezaru/rixuratu.pdf
    • http://gosaduzunake.myartsonline.com/karutamurexadadakadofu.pdf
    • https://s3.amazonaws.com/wozowuledij/7242855201.pdf
    • https://s3.amazonaws.com/zedudo/what_is_the_driving_test_like_in_minnesota.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105b2.bin
05d3c7662631207890c62ec5cc00bc9138fe024ee663be3cd0eafa8d1aeb2e8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 5592 bytes

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