Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0edced95fb0d59…

MALICIOUS

PDF

87.9 KB Created: 2021-03-30 09:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0d3a37ae25a02997c96dade2ae431a75 SHA-1: c92831cb72149d57cd35be32993d3b9881539e4f SHA-256: 4f0edced95fb0d59cb9fd8e1e31934b830730f86038c11256b69082ed275f802
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/award?keyword=bullying+el+acoso+escolar+libro+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482638/normal_5fcdd780b4bfa.pdfIn PDF document text
    • http://zakilifawurafed.22web.org/arabic_keyboard_free_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/jaselavujuwi/Igihgh7/top_speed_formula_racing_extreme_car_stunts_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nebuneduzib/RMT1O5z/bow_kingdom_come.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426690/normal_6035cc0276f29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453732/normal_601104d5d99de.pdfIn PDF document text
    • https://cdn.sqhk.co/lokatatape/bZHvn3m/sivizibaposod.pdfIn PDF document text
    • https://wujumumokujot.weebly.com/uploads/1/3/4/6/134613036/d1be75271739.pdfIn PDF document text
    • https://cdn.sqhk.co/zakolemafemo/yjjt0l9/bemowuzipofinijav.pdfIn PDF document text
    • http://sezituza.66ghz.com/xevezoxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_603edca0aee3e.pdfIn PDF document text
    • http://feziweninepiv.iblogger.org/82246304304.pdfIn PDF document text
    • https://cdn.sqhk.co/pakebisas/oXIEsrR/automapper_createmap_formember_list.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/gg7eNhc/33086944222.pdfIn PDF document text
    • https://juvujifakodokiw.weebly.com/uploads/1/3/4/6/134699996/wigirase_fazute_lijowigunojexi_nekapa.pdfIn PDF document text
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/simunevipulux.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/iBhf0gi/84988101523.pdfIn PDF document text
    • https://baxinumep.weebly.com/uploads/1/3/4/3/134366260/jenejejavedol.pdfIn PDF document text
    • http://guworumitikizu.iblogger.org/48530312343.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedagobugunuxi.rf.gd/curso_acordeon_de_botones.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_off00011760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11760 5612 bytes
SHA-256: 23ed23ec89b698c46ead499e49576fa536abb17451a6c7501957c6272ab81c4d
font_01_sfnt_off00012a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8C 12520 bytes
SHA-256: 88191179520aa7cf0320e5fc24517863f0a1a8a6eab93ec5e1bdaf3198ff3447