Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb72f3eeb2d88d1…

MALICIOUS

PDF

81.1 KB Created: 2021-03-24 21:18:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25a4eeb03ef8a849058f6bb4d58f22b9 SHA-1: cf8a2d961b56727b978d4ec97bfd7881a655b6cf SHA-256: 4cb72f3eeb2d88d1f738436ef20eca61565e5be4cd410def9e55daa20184197d
126 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm designed to redirect users to external sites, with one prominent URL being `https://seumenha.ru/strik?utm_term=pl+sql+pdf+free+download`. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack to drive traffic to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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=pl+sql+pdf+free+download
    • https://cdn-cms.f-static.net/uploads/4458407/normal_601832446deab.pdf
    • https://cdn.sqhk.co/vedisaso/gihdAia/51714637991.pdf
    • http://ukranews.site/fezifofomafawegojunetjq2wz.pdf
    • https://static.s123-cdn-static.com/uploads/4470524/normal_5fe42ebad5283.pdf
    • https://cdn.sqhk.co/lufelumad/2jj9fie/95474127088.pdf
    • https://cdn.sqhk.co/zuboxizip/kshegdv/axiforma_medium_font_free.pdf
    • http://pressit.fun/1667952192951u9w.pdf
    • https://cdn.sqhk.co/wepurodapike/Qhegejg/world_hockey_championships_2019_live_stream.pdf
    • http://masalev.ru/545735410198uljb.pdf
    • http://metalllift.ru/the_pit_and_the_pendulum_reading_guide_answerslpgrb.pdf
    • https://cdn.sqhk.co/reparepoki/zhsggeU/ninja_hattori_games_subway_surfers_game.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gogulet.rf.gd/padogonurodulali.pdf
    • https://s3.amazonaws.com/zizene/anari_no_1_full_hd_movie.pdf
    • https://s3.amazonaws.com/woxotopapozokev/physics_laboratory_manual_answers.pdf
    • http://jogulele.epizy.com/85294267116.pdf
    • https://uploads.strikinglycdn.com/files/78bfef1d-d71e-4659-a06a-6721f446595f/troy_bilt_mustang_50_deck_adjustment.pdf
    • http://resisimokopi.epizy.com/59022097715.pdf
    • http://sarigeselos.epizy.com/adoramus_te_palestrina.pdf
    • https://uploads.strikinglycdn.com/files/083bbf43-6359-48ef-9c75-8f7604548a94/64139884418.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_off0000ff27.bin
6896a755274fef0afb4ae382da09be7da15b42a4075b90b0a5ff7bc6b8b4974a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 5252 bytes
font_01_sfnt_off00011125.bin
8c22ea7159e113a54107b1d8460e2c13dcadc62e223c2c6cb13b980e66d579f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 11284 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.