Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d94a7db63e4887…

MALICIOUS

PDF

101.2 KB Created: 2021-04-10 05:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dac9a2fcd1d7cc72e58fdbeb4dc61524 SHA-1: 7da0a9aeb854b373f4ce1cdd39993f210e106170 SHA-256: 05d94a7db63e4887e6ba5db0f4d9ef4836f8b89cd23f7efe80eea391e45bc12f
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The presence of a URL like 'https://seumenha.ru/strik?utm_term=what+is+the+moca+test+for' indicates a potential phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://seumenha.ru/strik?utm_term=what+is+the+moca+test+for
    • https://static.s123-cdn-static.com/uploads/4367922/normal_5feb95803c17c.pdf
    • https://cdn-cms.f-static.net/uploads/4465263/normal_6033357d8d3a3.pdf
    • http://pugalibapuf.iblogger.org/mystic_messenger_guest_list_guide.pdf
    • http://davoxamewurolez.iblogger.org/medical_microbiology_murray_download.pdf
    • https://cdn-cms.f-static.net/uploads/4426815/normal_60318d8b5c123.pdf
    • http://juwatorota.22web.org/five_night_at_freddy_online_subtitrat_in_romana.pdf
    • http://bigakeka.iblogger.org/87028415415.pdf
    • https://cdn-cms.f-static.net/uploads/4403817/normal_6061cb62bc17f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://refawolasuwibi.epizy.com/jodedozubazakisikizagaz.pdf
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_7a4410ec423b446a9fa47d92c8dc3cd0.pdf?index=true
    • http://magajavopisili.epizy.com/39219986844.pdf
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_cd493ad92df046df914ef81b3a3033dc.pdf?index=true
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_9847f5d0e3e24dc5b657a6679c28ca5c.pdf?index=true
    • http://tumupikujam.epizy.com/g_2_residential_building_plan.pdf
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_94a57884876045e88c73d7b1e8110405.pdf?index=true
    • http://popirarubinuluk.rf.gd/psychology_of_girl_in_love.pdf
    • https://uploads.strikinglycdn.com/files/946415fb-c063-4c4f-aaee-a01819f91b78/reviews_2018_lexus_nx_300.pdf
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_4fc1c01931994d1e916febf50b7d5bbf.pdf?index=true
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_770ae1fe577d49079b2d47de17df017a.pdf?index=true
    • https://22e44a25-5b44-49ab-8bd1-9de78d2943b2.filesusr.com/ugd/cce535_5d2c9abfccd6492889087c0eb21eee35.pdf?index=true
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_9594aa2400804363b716b35eb3c629f0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f9fffec2-aa4b-411e-8b5a-89ee81693e65/85970988178.pdf
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_5120d1ca906f40feb3c3ba55c590824c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c866fd40-8676-4153-b7d0-61bf91a77f55/norse_mythology_books_for_young_adults.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014dde.bin
12938069d61ae18ca56208978bf0129b278ce9782dcf4aa7e95fa324ed127de5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDE 5100 bytes
font_01_sfnt_off00015f1a.bin
7f523470783221877d0a13b37bd42e2ae75f93acf59a764eb62d359676ef2641		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F1A 11612 bytes

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