Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf74613d3d539752…

MALICIOUS

PDF

79.2 KB Created: 2021-04-18 11:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17e4dc3504a8fe94a619eb3ac289956b SHA-1: 21a9125952561a49e870dc342ce700a0fb290027 SHA-256: bf74613d3d5397521a02e0d1daedc68f8c95f66e93aa83c09d1e90c034bbabb5
204 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, suggesting a distribution mechanism for malicious content. The presence of a 'password-protected archive' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware delivery attempt. No scripts were extracted, but the overall structure and heuristics point to a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=the+little+book+of+valuation+portugues+pdf
    • http://gumugupibope.iblogger.org/6281136821.pdf
    • https://cdn.sqhk.co/nimotixalulo/0jguLRO/please_find_the_report_attached_below.pdf
    • https://cdn.sqhk.co/gixedomawa/PASiePN/sonic_2_mod_apk_offline.pdf
    • https://cdn.sqhk.co/dodirijobadi/jahgPCg/cops_and_robbers_minecraft_server_pe.pdf
    • https://cdn.sqhk.co/mogizufofuj/f39Lwgj/86042692951.pdf
    • https://cdn.sqhk.co/leporolino/ggfiLgd/fefesadaregaliladurexivar.pdf
    • https://cdn.sqhk.co/vigefifobot/DFdAhc7/goregukeduxupozezevovuzu.pdf
    • http://risunololalej.iblogger.org/tilagetitowenezofawujape.pdf
    • https://cdn.sqhk.co/vasibejovej/ifhjPgj/caracteristicas_del_materialismo.pdf
    • https://cdn.sqhk.co/xafeperale/gfxgqn0/tupidetokudiligujiki.pdf
    • https://cdn.sqhk.co/kolusugego/aiWggib/tuzajofawegopok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/203ddfd1-9a5e-4828-a8d2-47a576f5960f/pride_celebrity_xl_4_wheel_scooter.pdf
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_9da5d371d3bd476493c36bd40ab4dbc2.pdf?index=true
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_d583af1f38a64eeb89a3f43ca9029ad0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d195eacd-8e83-4280-b142-830bf2fd63ac/will_cyberpunk_2077_release_on_pc.pdf
    • https://uploads.strikinglycdn.com/files/d4660272-7365-4627-95ae-2dd79380d5aa/zuponogepogizakozit.pdf
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_76c8b4fbb8f44ebcb906cc1a45e8c7c6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a396fd6b-db05-4663-a82d-a70a39e06aa3/craftsman_front_tine_tiller_repair_manual.pdf
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_73822617a8e94df29df194352f004492.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ae9ef627-f079-4b4d-80ea-cd38bfcf7b6b/fuwini.pdf
    • https://uploads.strikinglycdn.com/files/070cbcb0-42ce-46d5-94bc-2318e15f2540/gudoserexapagupefexijawa.pdf
    • https://uploads.strikinglycdn.com/files/a246e1be-6be5-4fcd-ab8b-1ea2f79b68b8/medical_anthropology_a_biocultural_approach_4th_edition_ebook.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_off0000f272.bin
27eec3beaaf24ac63a00360183bf3ecabf95833dbd98c82b7e50290ed4a221f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 5516 bytes
font_01_sfnt_off00010534.bin
5c9571843e4a318c51b1ff1a311f852dce04e46ba441128a3d2b6c04d945f90c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10534 13204 bytes

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