Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c4952643c5c0bb…

MALICIOUS

PDF

73.6 KB Created: 2021-03-31 03:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 466383ad8bd98d548f2e236d1f64e464 SHA-1: e897d808cf568c99043d21fb1cbb5fd58624b38f SHA-256: 91c4952643c5c0bb366c2d16db679879fd9026ca74d311ac255b315960b39067
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous external URLs and a heuristic indicating it's a link farm on disposable hosting. Crucially, it includes an instruction to disable security software, a strong indicator of malicious intent to bypass defenses. While no scripts were directly extracted, the presence of external links and the security bypass instruction suggest it's designed to lead the user to a malicious site or download a secondary payload.

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://xajibur.ru/wix?keyword=selfish+net+for+mac PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476569/normal_5fe910174e187.pdfIn PDF document text
    • http://geekcods.com/its_kind_of_a_funny_story_imdb_rating6m6jq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382418/normal_603347906b36d.pdfIn PDF document text
    • http://creditscorerepair.info/deep_vein_thrombosis_case_reportehsw3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451205/normal_600af8fa35084.pdfIn PDF document text
    • https://cdn.sqhk.co/takepoladev/ggjigq2/open_heart_surgery_new_games_offline_doctor_games.pdfIn PDF document text
    • https://cdn.sqhk.co/zibavuna/vHgjGja/sigapilabozeteputu.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/hjidQud/rounded_rectangle_tool_illustrator_2019.pdfIn PDF document text
    • http://cardioactiveuficiale.site/dijiliziko4xbbn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_5feaf019e5e8f.pdfIn PDF document text
    • http://wexypay.icu/lopatodojufogefeporuwujanvqzum.pdfIn PDF document text
    • http://wimuzawoxi.getenjoyment.net/vuzulazujibek.pdfIn PDF document text
    • http://samelike.site/vasamoro4jy3f.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/ijICV8D/ping_pong_net_and_paddles_target.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405185/normal_605c6de868e24.pdfIn PDF document text
    • https://cdn.sqhk.co/kapumikogux/Sm3gyje/67518803585.pdfIn PDF document text
    • https://cdn.sqhk.co/kuretunaba/jMhc8LH/divani_patchwork_in_offerta_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468536/normal_5fdb8911a63c4.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/81333141091.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387825/normal_5ff19c2f2e19b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 5224 bytes
SHA-256: 9230c09ceb423aa6e3bc349114419ec1f1e33903d0723096f4a1c26ccd28006b
font_01_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 10732 bytes
SHA-256: 664ad96f6ac51452a0dc5e4421e3299ad5693a571e481eba8a4b4c33c772fc7e

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