Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a816d195ccc2144…

MALICIOUS

PDF

78.4 KB Created: 2021-04-19 13:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8445c95728dd3246dee1a45ce9a3e6d3 SHA-1: 734f9b282c31b8bf40d43c970d5849bba8e41147 SHA-256: 8a816d195ccc2144982b730e683d46bca8cec3ca6278ff89893e757887ade278
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains numerous embedded URLs, many pointing to disposable domains or redirectors, suggesting an attempt to lead users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, commonly used for SEO poisoning or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=yamaha+yas-101+soundbar+specs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478125/normal_5fdff82668688.pdfIn PDF document text
    • http://laulu-go.ru/xasofagfnyo6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403683/normal_60534a699bb22.pdfIn PDF document text
    • http://site-shop.xyz/241616398432ygfb.pdfIn PDF document text
    • http://familyit.info/74256741416z3o9p.pdfIn PDF document text
    • http://price-list.moscow/control_systems_engineering_norman_nise_7th_editionohega.pdfIn PDF document text
    • https://cdn.sqhk.co/dopiporajen/Cifjjhc/bluffton_sc_county_auditor.pdfIn PDF document text
    • https://cdn.sqhk.co/tesolivu/gciihid/harvest_moon_game_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/lizuloka/ihbYAgh/wellness_coach_jobs_melbourne.pdfIn PDF document text
    • https://cdn.sqhk.co/jugokake/ediajjs/28077942448.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/WP1jggc/my_super_movie_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/fghLM0s/rumosanovizamikerigovoj.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/jiiikgd/emergency_contact_wallet_card_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481397/normal_601cc66623edd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_c41e1c95a00c4cbdbd263357d1792215.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/neporezofov/functional_trainer_core_workout.pdfIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_26d65cbad8df4320a2d3811b72976bbb.pdf?index=trueIn PDF document text
    • https://9301df3d-c689-496c-811c-0581e5fecd74.filesusr.com/ugd/f62067_6fd308fcac57406aab75c3609906080a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/what_are_the_examples_of_foodborne_diseases.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/jersey_gambling_commission_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/gibuzalivemasebaroju.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 5708 bytes
SHA-256: 8c54ba4ec8c4535fbe73d2348439d3114a753dca9e4a49b283c3a48046f80c28
font_01_sfnt_off00010704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 10860 bytes
SHA-256: 5c4d6a4c368534bd250dfa422c3098eb2378fe2ce9706e5977642c86619a8319

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