Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a31dfa7c33fabe6…

MALICIOUS

PDF

78.3 KB Created: 2021-04-07 22:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1daacf4ff11fe7825ddaa5ef7d40b6c0 SHA-1: 85cb9f15f7faf8f55317662b72fc03159b23afaa SHA-256: 3a31dfa7c33fabe6dab71e715a99d86a500b0cf3b707ebc17b7a7819275fbf96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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/wix?keyword=apush+chapter+4+quizlet PDF link annotation
    • https://cdn.sqhk.co/kebokeregim/qPhdJIZ/super_mario_2_egg_shooter.pdfIn PDF document text
    • http://daravto18.ru/judesudenexoxesuehoj.pdfIn PDF document text
    • http://tertov.xyz/wikepemutewiredakibwoqdy.pdfIn PDF document text
    • http://futup.ru/antarctic_ice_sheet_massx1n45.pdfIn PDF document text
    • http://urolog.xyz/khloe_kardashian_book_barnes_and_noblei93um.pdfIn PDF document text
    • http://maximizator.xyz/zombie_hunter_movie_castdlknt.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/dAhtH6R/51279894991.pdfIn PDF document text
    • http://xefopuro.mypressonline.com/attestation_d_hbergement_pour_visa.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/cPjiLM2/tabaxonafomagovisusiso.pdfIn PDF document text
    • http://jafinipu.scienceontheweb.net/entrepreneurship_management.pdfIn PDF document text
    • https://garasomebopite.weebly.com/uploads/1/3/0/7/130775476/lisoladipexib.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvuwoki/jfBxXie/22298976505.pdfIn PDF document text
    • http://didazema.mypressonline.com/television_and_american_culture_jason_mittell_ebook.pdfIn PDF document text
    • https://bilagezapa.weebly.com/uploads/1/3/1/1/131163658/wosowir.pdfIn PDF document text
    • http://omerkatanalp.com/508337852361ye3f.pdfIn PDF document text
    • http://vurovolapoza.mygamesonline.org/jeligelepuwixiwig.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/xhgSgeU/download_fr_legends_for_pc.pdfIn PDF document text
    • http://securespot.ru/rekupugoxoujpi8.pdfIn PDF document text
    • http://eglo.club/77300736334d2iix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://retiziwo.myartsonline.com/oman_arab_bank.pdfIn PDF document text
    • http://farudigenudoze.onlinewebshop.net/84185054463.pdfIn PDF document text
    • http://tobidogajetu.onlinewebshop.net/66306776381.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 5276 bytes
SHA-256: c71719836952d64584c38ccbb0c97cada5466001966038ca6be33ced20be824f
font_01_sfnt_off000104f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F8 11508 bytes
SHA-256: dcda041e0a6f630d170c60dd3418b6e38a0d8d41d2d96f64ca930874914bbdaf

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