Malicious PDF — malware analysis report

Static analysis result for SHA-256 359d664b7d99b1da…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 05:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 237f5039e7d532954063aa68cdd944b3 SHA-1: 77fe93cdfb7a19e3ee5d483914f2e5099a138d4b SHA-256: 359d664b7d99b1da24263f1c7be2c473da1b1fe15cd7d4c783a66372dbaa331f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and the presence of many external links suggest it's designed to lure users to malicious sites, aligning with a spearphishing attachment tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://laborke.ru/uplcv?utm_term=kumkum+bhagya+today+episode+full+episode PDF link annotation
    • https://nepalonetours.com/userfiles/files/nigagikamutajixasexiduva.pdfIn PDF document text
    • https://desco.scp.hr/files/31398052710.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/naxuseg.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/tipusedomulovizifo.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/73466526769.pdfIn PDF document text
    • https://dom-titan.rs/files/fevofelazamitafomubege.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/90568014006.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/95798008482.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/pujidoruxonabawojali.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/85978420981.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613204eee6c4e---52019416793.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/kewiwonidasezegex.pdfIn PDF document text
    • https://service-panev.com/userfiles/93084113026.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/sorujizulowisuxi.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///96338216170.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/40911122671.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/penog.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210910212015479.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/85539057144.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/99689481058.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/kefakupokijibawisezi.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210911080313.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/93005594704.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210910_46FF19DD412BF345.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/zawidegikiniparixezobew.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/lusuzunejatomagozi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FF 18524 bytes
SHA-256: 09d91ff3da5eded9992793ec404553e5a1ad5c201ba7110dc71febdc566afc28
font_01_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 11180 bytes
SHA-256: eaaa4009a044e7baef2767534ac4fd4d695bbeb1b3fa2b6b594d0dd5e8ebfbf4
font_02_sfnt_off00011edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1