Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea35d60431980b0…

MALICIOUS

PDF

76.5 KB Created: 2021-04-02 19:39:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f59bf6f4b4f6044a76be9f329926ffe3 SHA-1: 22d425e3d68d75a2b2088f5e2fa8551986451fb0 SHA-256: cea35d60431980b019bd5c497aff9894674a8bff9a3f8d6232761977f77b2ccf
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://dugedepap.ru/award?keyword=derrida+aporias+pdf PDF link annotation
    • https://cdn.sqhk.co/vipujitebiki/fghigjf/marujatilini.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/iigRSmN/dragon_shooting_survival_games_online.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepilekot/VlThagf/relaxing_music_for_sleep_rain.pdfIn PDF document text
    • https://cdn.sqhk.co/fetumamuv/oigKkgh/prisma_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/DjeHPW4/dino_hunter_deadly_shores_mod_apk_unlimited_energy.pdfIn PDF document text
    • https://cdn.sqhk.co/fotinegataso/cggghf6/wuninalu.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/mfaiilR/45853243270.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/hcieogg/flick_goal_stage_2.pdfIn PDF document text
    • https://cdn.sqhk.co/rutunidosaw/giYPjjd/animal_restaurant_game_customers.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/Lbih3e3/36007672429.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/hkjgGie/survivor_island_of_the_idols_cast_winner.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/VTjaA8R/56857920349.pdfIn PDF document text
    • https://cdn.sqhk.co/nabotogemobe/95FEid5/roaming_prepago_movistar_el_salvador.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a181bb3e-7445-4f1f-a1cf-b2fe66c13e92.filesusr.com/ugd/91ce54_e83e815fbdab4d0181c75e11049a8642.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_01bd324bac394458bd47004a30279e8b.pdf?index=trueIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_6167950f90104233a9b68f85db056913.pdf?index=trueIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_2f85fe50509a45388426aee86206bcb7.pdf?index=trueIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_4ab2fb08ef8149759477249aba57b168.pdf?index=trueIn PDF document text
    • https://a1104102-e7f7-498f-9db5-fd16eb5a1c84.filesusr.com/ugd/3f19aa_cda23d73f6404078b0f3a6302e29edba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legenapi/cmos_digital_integrated_circuits_analysis_and_design_4th_edition_solution.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/50054435137.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_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 5004 bytes
SHA-256: a1889e1b025e08ba76355734c7a9817f91c3dd305cb065b4a3818b11fe42a9d4
font_01_sfnt_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 12868 bytes
SHA-256: ce11f5f659b5f1e15f8f823c7832dc3db8feebb8b4e552cf3d2b8c77b6877bd2

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