Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66c34ad0bc6bad1…

MALICIOUS

PDF

81.3 KB Created: 2021-05-07 06:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a097d20aec4b893600fb289db9cf0fe SHA-1: 2b095bfa93d983b94cc8985f3effb5a3cc34f2f2 SHA-256: b66c34ad0bc6bad10a9fc44bb7dca5f63fe92aef5a492629c4c4e2e1ab82ace4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination. The primary malicious URL identified is https://seumenha.ru/strik, which is likely used to redirect the user to a phishing or malware-hosting site.

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=what+is+a+prayer+in+a+court+case
    • https://cdn.sqhk.co/dodamewope/pEGig5R/25596000532.pdf
    • https://cdn.sqhk.co/favosejo/gdihMxV/doxipubemutemen.pdf
    • https://rawuwivusezorom.weebly.com/uploads/1/3/1/4/131406564/3415814.pdf
    • https://cdn.sqhk.co/wifinalimow/icjjhiE/82258503572.pdf
    • http://rixujewo.getenjoyment.net/sidelaxevet.pdf
    • http://lokiraboxa.22web.org/albuterol_neb_davis.pdf
    • http://wotidoteked.mywebcommunity.org/lofibiguvonu.pdf
    • https://vobubivozabu.weebly.com/uploads/1/3/4/3/134320693/b9e26b4ac8d165.pdf
    • https://cdn.sqhk.co/vukixukafoga/M1vfheo/apostolic_faith_mission_membership_form.pdf
    • https://riwipawubo.weebly.com/uploads/1/3/1/4/131453561/zuzeripi.pdf
    • https://cdn.sqhk.co/jupozaregu/jTCOjby/falivejakamokujuxi.pdf
    • http://kigirifaduguv.getenjoyment.net/athens_street_map.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wonumafubij/motorola_moto_g6_user_guide.pdf
    • https://s3.amazonaws.com/bisegilupuf/example_of_conversational_ai.pdf
    • https://s3.amazonaws.com/gofilafixu/what_are_medical_claims.pdf
    • http://fawalexigin.epizy.com/geridubadumobezopujeda.pdf
    • http://rubigireluj.rf.gd/air_force_x_group_model_paper_download.pdf
    • https://s3.amazonaws.com/lebaxa/flujo_de_materia_y_energia_en_los_ecosistemas_marinos.pdf
    • https://s3.amazonaws.com/gafedupeba/piano_sheet_music_for_beginners_free_printable.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f275.bin
1ce438a7a2c28fd4f3e4c7873f3c7af7bfa5ce809ae9b6d21041a10b07da9615		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 4988 bytes
font_01_sfnt_off0001036d.bin
31a90022a7f2cc9374d44496758ce966f0e70a46bd94bff95c7b584e9d900129		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 11160 bytes
font_02_sfnt_off0001299f.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1299F 4324 bytes

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