Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9a5141f760eea9…

MALICIOUS

PDF

75.0 KB Created: 2021-03-01 13:53:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 85be15d97f4ab98d26e50d38d7ea8454 SHA-1: b8f20fb720d308e87cc6a583092108adbf730303 SHA-256: 8c9a5141f760eea9861c33c589ee59bd066cba6544836ff9e44a041f75e34e78
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely part of a phishing or malware distribution scheme. The document body, though partially corrupted, contains text related to a free spider card game, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/award?keyword=jeu+de+cartes+spider+fran%25C3%25A7ais+gratuit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476446/normal_5fceefb95a408.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374537/normal_5fe222ced825e.pdfIn PDF document text
    • https://wipezupogev.weebly.com/uploads/1/3/4/3/134307181/vidijuzikiba.pdfIn PDF document text
    • https://cdn.sqhk.co/mewowoji/jiCiajg/81545442984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413454/normal_601146a775e4d.pdfIn PDF document text
    • https://cdn.sqhk.co/roziguze/aFhfygf/mythbusters_car_running_while_pumping_gas.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/licgdgc/jetazimetineroterufaneki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461204/normal_5ff8c2fd19e33.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/hcGuhcc/poner_perfect_tense.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/frZmNjh/pivomimomaxak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://palalujopaxuv.epizy.com/lamebuw.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/handwriting_sheets_for_left_handers.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/readability_report_microsoft_word.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/tapir_facts_and_information.pdfIn PDF document text
    • http://givugiv.epizy.com/tripartite_guidelines_mom.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/kose_whitening_sheet_mask_review.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_off0000e53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 5460 bytes
SHA-256: cecef8b1898b949b8cfe8387f51e53c47cd228a75e3266f232d684ec511de0b9
font_01_sfnt_off0000f79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 11828 bytes
SHA-256: d4975c29062805e9da8a57da1709f32a9f0143aa3943fafc0cf05b1009dadca1

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