Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9b5893c2315625…

MALICIOUS

PDF

77.8 KB Created: 2021-01-25 12:26:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4f7d456131aed80dc9b483eeed2c9525 SHA-1: ef40d64699c1f9020e20da78ba66d29fd7c9af6e SHA-256: fd9b5893c2315625627e567451a9382c0a7799b25299c4ba65bbebf7530a9cf6
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains metadata suggesting it is a 'Dune board game rulebook', likely a lure.

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://bologen.ru/123?utm_term=dune+board+game+rulebook PDF link annotation
    • https://cdn.sqhk.co/jijekabadox/eUgcUhb/parent_plus_loan_interest_rate.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/KOCjehb/kipowudaxosatugajutixibi.pdfIn PDF document text
    • http://natorg.fun/battery_operated_tabletop_fountain_pump1ayif.pdfIn PDF document text
    • https://cdn.sqhk.co/fofubulami/eB5YjbD/portal_de_atencion_al_usuario_sib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501989/normal_5fd787833f6fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449406/normal_600db2700040c.pdfIn PDF document text
    • https://cdn.sqhk.co/riteximeras/joGhgjb/75330629633.pdfIn PDF document text
    • http://raifaisentgo.online/android_radio_app_head_unitsg9n4.pdfIn PDF document text
    • https://vobulesije.weebly.com/uploads/1/3/1/8/131857334/gameguku_zixamolewuzudit_tizagaz_setisap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379498/normal_5fec9a674c0b2.pdfIn PDF document text
    • http://fakosujonipej.iblogger.org/chaconne_bach_guitar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xubaforan.epizy.com/kijuzofuladaviranomujif.pdfIn PDF document text
    • http://sitotozip.rf.gd/winezipomuvevezokazisu.pdfIn PDF document text
    • http://zumebixakefeta.epizy.com/bend_oregon_map.pdfIn PDF document text
    • http://wuwatomugexove.epizy.com/the_shroudbreaker_sea_of_thieves_guide.pdfIn PDF document text
    • http://zakivijojinikij.epizy.com/parineeta_bengali_movie_song_ringtone.pdfIn PDF document text
    • http://gikunipif.epizy.com/19714935197.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_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 5172 bytes
SHA-256: 9c090f2f4af63f6f65fddc904c8c7c446c16ed89e7eb17d4e9f37dbf6ef218d7
font_01_sfnt_off00010506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 11000 bytes
SHA-256: 68e9cdff36a5ed7a3b5608fd6a619859551e99974eda8cbbb9093ccd614a79fc

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