Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2099615aad0107…

MALICIOUS

PDF

77.5 KB Created: 2021-05-14 02:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f381aced8b982da0b6d866e57d37b876 SHA-1: 85631bd3256ff83c91cee202d1efe853fe6a1df7 SHA-256: 6a2099615aad01076063def604a08f886cfe291e1a3d033fdcae2077735bea0f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged by heuristics as a link farm designed for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the PDF structure itself is weaponized to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/strik?utm_term=best+short+reads+2020
    • https://jiwedizuku.weebly.com/uploads/1/3/4/3/134310564/vijuxekuz.pdf
    • https://nosekuge.weebly.com/uploads/1/3/2/7/132740467/dexajuvobu.pdf
    • https://cdn.sqhk.co/reruzemafow/rhhkhc8/how_do_i_draw_lines_on_a.pdf
    • https://cdn.sqhk.co/jemajujo/dRgeGja/26379255309.pdf
    • http://nevoxodaw.66ghz.com/hadestown_original_cast_recording.pdf
    • https://cdn.sqhk.co/doporaba/aicjjn4/kujilopudige.pdf
    • https://cdn-cms.f-static.net/uploads/4443803/normal_605d700cd2bf0.pdf
    • https://cdn-cms.f-static.net/uploads/4366003/normal_601d85de7944d.pdf
    • https://cdn.sqhk.co/birofinud/hc1ghpk/police_car_with_siren_toy.pdf
    • https://cdn-cms.f-static.net/uploads/4401546/normal_6067d474c8e5e.pdf
    • https://static.s123-cdn-static.com/uploads/4464715/normal_60016b517c619.pdf
    • https://jobajepefo.weebly.com/uploads/1/3/1/4/131482915/dilonajabizananuz.pdf
    • https://julavatevimire.weebly.com/uploads/1/3/4/6/134669339/vizosewovuroxa_ridef_vitabitezubobi_jurigep.pdf
    • https://jobawanajofuru.weebly.com/uploads/1/3/4/0/134042661/b839797.pdf
    • https://rizigavitud.weebly.com/uploads/1/3/4/5/134581125/vejizanagudatedones.pdf
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/fizetabupuma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fejewipup.rf.gd/joparelurotoxixasagek.pdf
    • http://zomekitutaduvuv.rf.gd/surat_yasin_dan_tahlil_arab.pdf
    • https://uploads.strikinglycdn.com/files/09303c20-0e63-4dbb-bedb-41726d20119a/39493686148.pdf
    • https://uploads.strikinglycdn.com/files/7367ae8e-6bc3-4f3a-a597-3179328e68e0/dinesutiliwirujij.pdf
    • http://kitivej.epizy.com/75645071640.pdf
    • http://xexerekiw.rf.gd/8964229295.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_off0000f346.bin
bc68e266cc42c67180f67bbb52f4c9f5a1622d7d1509c5914d0774e044fe42f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 5204 bytes
font_01_sfnt_off000104f3.bin
5f7dff6cdcbec7a8cc7bb96fe7fdca24b6aeb9e71a4f05cb3f70b1eaff66a672		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104F3 10388 bytes

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