Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd04c6694515063…

MALICIOUS

PDF

91.1 KB Created: 2021-02-22 07:48:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3cf667837075ea1b3091146ed2306931 SHA-1: 78ad86b83a8b3e6a62aa3e87cf587c3096a70390 SHA-256: 9fd04c6694515063d7944dfc77ef29e0e7f32d7d9e6b0a256a64505e3f07f558
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://maypoin.ru/strik?utm_term=how+writing+works+a+guide+to+composing+genres+pdf+free PDF link annotation
    • https://cdn.sqhk.co/dijadive/idkEijq/petrochemical_engineering_salary.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/aUlQNhb/horse_racing_live_com.pdfIn PDF document text
    • http://usecabinets.xyz/new_american_cuisine_cookbookfa2w3.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/cgcg2yM/best_minecraft_pickaxe_enchantments_command.pdfIn PDF document text
    • https://cdn.sqhk.co/sonorizeluwi/bEjgejd/buzasorukobikokaxuzejovil.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzexesetaba/ETohigc/kaposokojodusujiz.pdfIn PDF document text
    • http://swiss-gear-top.xyz/c_d_dog_food_side_effects3zxf3.pdfIn PDF document text
    • http://gufutaca1.xyz/depulopfzzzt.pdfIn PDF document text
    • http://vengriya.space/infinity_shooting_galaxy_attack_cheats0prmy.pdfIn PDF document text
    • http://lebanage.iblogger.org/14868007019.pdfIn PDF document text
    • http://uber-global.com/putaf4twb0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kexomuradalo.rf.gd/jajeguromesobiwuzegafil.pdfIn PDF document text
    • http://verirajoxa.epizy.com/76955615282.pdfIn PDF document text
    • http://girinuluzu.rf.gd/gun_mod_for_minecraft.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/missguided_faux_fur_coat_grey.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/fidifodem.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/industrial_craft_2_progression_guide.pdfIn PDF document text
    • http://roxubimolileko.epizy.com/dreamweaver_for_windows_7_32_bit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 5444 bytes
SHA-256: 40f23a0841c313f4186b18e5a437e0581b19f2522c667b2d6a0c13cf85188561
font_01_sfnt_off0001285b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285B 11944 bytes
SHA-256: 5eff1959b3d9067aefaec82734f5c3e934626905a891dd3bafa7679b8a756098
font_02_sfnt_off0001505d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1505D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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