Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2ac823ab561a6f…

MALICIOUS

PDF

77.8 KB Created: 2021-05-02 10:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 11d9a79a755ca767e7596fb9ead6a03a SHA-1: 28140ca73e91ee3515e4ad96d5335f0df15c6a7c SHA-256: cb2ac823ab561a6f452ce382e13b2c2b2e020b8f979330f5234eced25fa4e1d3
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, suggests a lure related to a 'Clover pos system manual'. The presence of numerous external URIs, including one pointing to 'jacksth.ru/strik', indicates an attempt to redirect the user to potentially malicious content. While no scripts were explicitly extracted, the PDF format and the nature of the heuristics suggest potential for embedded JavaScript or other exploit mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/strik?utm_term=clover+pos+system+manual PDF link annotation
    • https://zefisuket.weebly.com/uploads/1/3/4/8/134868467/5939591.pdfIn PDF document text
    • http://fakts.design/heroic_qualities_of_beowulfs7dwd.pdfIn PDF document text
    • http://bumufirila.mygamesonline.org/different_types_of_pneumatic_valves.pdfIn PDF document text
    • http://card2card.live/rci_2950_microphone5dzhq.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/9227548924.pdfIn PDF document text
    • https://pabedowilopore.weebly.com/uploads/1/3/1/1/131163579/nanivile.pdfIn PDF document text
    • http://vepenuvix.mygamesonline.org/teoria_del_contexto_social.pdfIn PDF document text
    • http://idealslimitaly.site/state_of_survival_zombie_apocalypse_mod_apk5hif1.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/new_yorker_caption_contest_740.pdfIn PDF document text
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/vogag.pdfIn PDF document text
    • http://kukogekaw.sportsontheweb.net/wuketedudagumavojuwaros.pdfIn PDF document text
    • http://nateribebomulaz.medianewsonline.com/gnss_surveying.pdfIn PDF document text
    • http://vovality.club/49425831163s32f4.pdfIn PDF document text
    • https://natesikapepik.weebly.com/uploads/1/3/4/7/134750077/9373524.pdfIn PDF document text
    • http://pukitifafizeba.mywebcommunity.org/91416816082.pdfIn PDF document text
    • http://nogeturafo.sportsontheweb.net/solving_behavior_problems_in_autism.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/where_can_i_donate_gently_used_toys.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zepizevut.atwebpages.com/75532758126.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/12633808494.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/business_intelligence_and_business_analytics.pdfIn PDF document text
    • http://nudagimanefej.atwebpages.com/69965393442.pdfIn PDF document text
    • http://pevipitoz.atwebpages.com/maths_formulas_till_class_10.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/media_player_win_10.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/world_war_z_game_price_playstation_store.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_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 5032 bytes
SHA-256: 99fed094320e2e3dbf94abda60b0a8ff8fd59c9de307691889f54f8cc1c2e3a7
font_01_sfnt_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 11592 bytes
SHA-256: 4f9569eeb759d222accfe676fb11516b161f8ef7b165af61748553397d072cef

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