Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98f094cca5e4855…

MALICIOUS

PDF

73.2 KB Created: 2021-02-08 19:55:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2bef53bb67bcccae2c2179f84988e20 SHA-1: 0784512db07a2e76ca82626fef4d21ee5941f159 SHA-256: f98f094cca5e485559891180cf9ecbc56fb6d3dedf45008fd63af9206f0b0d12
226 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of an advance-fee scam, as indicated by the 'SE_ADVANCE_FEE_SCAM_LURE' heuristic. It contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection further support its malicious nature, with the primary lure appearing to be 'slot machine games unblocked'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://jacksth.ru/123?utm_term=slot+machine+games+unblocked
    • https://repugololenip.weebly.com/uploads/1/3/4/8/134880500/fokudugese.pdf
    • https://static.s123-cdn-static.com/uploads/4368756/normal_5feb98b30a7a9.pdf
    • https://gabubogoko.weebly.com/uploads/1/3/3/9/133997439/2526848.pdf
    • https://cdn-cms.f-static.net/uploads/4425224/normal_601b9a8145362.pdf
    • https://cdn.sqhk.co/jedepazisu/hvhcia0/81077790407.pdf
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/4581137.pdf
    • http://libralab.digital/ice_sheet_definition_environmental_sciencecnhkw.pdf
    • https://cdn.sqhk.co/wepurodapike/0ijhgqB/snes_classic_hack_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4464539/normal_5fd13ab224e4c.pdf
    • http://prizinsta.site/the_solar_system_song_aj_jenkins_lyrics3znmh.pdf
    • http://girlsbeach.space/world_war_z_best_zombie_movies79gp9.pdf
    • http://jaraxusej.iblogger.org/archicad_15_tutorial_free.pdf
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/63e443.pdf
    • https://dukowitemodilel.weebly.com/uploads/1/3/5/3/135316140/nizifujulepem.pdf
    • https://xuvuvigaxopezut.weebly.com/uploads/1/3/4/7/134721928/9916463.pdf
    • https://cdn.sqhk.co/bexutavukaro/jfcAsks/68283654344.pdf
    • https://gubulugovidenu.weebly.com/uploads/1/3/1/4/131406252/gamimewabizekoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e21f.bin
3f634d9c763d2fffec09263af2004a07bd6c27593719ca495cd015e7ec0c710a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 5564 bytes
font_01_sfnt_off0000f4e1.bin
4ae2836fb9d576875757f9d8b81282cd16f7394b4c7b44003534e3edacc1e4a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 10208 bytes

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