Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3d61030fd77023…

MALICIOUS

PDF

97.6 KB Created: 2021-05-17 10:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8d0e2bfc271ee409645473466474196e SHA-1: 2892ad9f3537bf64597d01106eded8a72be36822 SHA-256: 2c3d61030fd770236e6b09675496def51c1837f5b8e1dade94a9b2ca609dd6c6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, many of which are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to a book summary, which is then used to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=resumen+capitulo+3+el+principe+maquiavelo PDF link annotation
    • http://aycotoro5.xyz/videos_sponsored_by_monster_legendsmyh1p.pdfIn PDF document text
    • http://gimakelodikovij.iblogger.org/canon_rebel_t5_battery_life.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/2KigYzE/facts_tuition_management_login.pdfIn PDF document text
    • http://ogranicbio.space/bully_scholarship_game_for_android_freeq97o7.pdfIn PDF document text
    • http://wei-nmvc.com/the_decision_book_quotesjeer7.pdfIn PDF document text
    • http://businesshelpservice.com/4th_grade_sbac_practice_test6b88n.pdfIn PDF document text
    • http://pipvip.ru/dikijifjguiq.pdfIn PDF document text
    • https://cdn.sqhk.co/junulevi/ZCgh4F5/60646989147.pdfIn PDF document text
    • http://nudistoff.club/mariwujexuxobikiposobugu515zo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402481/normal_5fc9e97f983a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473638/normal_600394995b187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_605afaf251740.pdfIn PDF document text
    • http://premial.su/268462418620qj6x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vesunak.rf.gd/biochemical_engineering_fundamentals_mcgraw_hill.pdfIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_3a6d25db71e64ae88e0107cc1dbc6961.pdf?index=trueIn PDF document text
    • http://gusabonatixuk.rf.gd/livestock_production_management_book.pdfIn PDF document text
    • http://vefejabenu.rf.gd/6136444153.pdfIn PDF document text
    • https://7a6021ad-ea99-40b3-bafb-6570e045b460.filesusr.com/ugd/527ec5_f0b07163028046e18016574627c52c99.pdf?index=trueIn 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_off00013e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E02 5436 bytes
SHA-256: 440bb2e3436f1ac499da981a363257ef2e50159b460f722d195f55c9226e354a
font_01_sfnt_off00015079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15079 12368 bytes
SHA-256: b3414d9ebd112a9dfd704bcccfc983dab85b2c5ab903378abbd824adb9bd1416

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