Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af636c07c673432…

MALICIOUS

PDF

79.8 KB Created: 2021-05-18 00:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86dc77b670a657752c67f7c83ac496e5 SHA-1: bab1baac1efee40fe4ee5282965d119433c9f895 SHA-256: 4af636c07c67343235dc6a5d22a535a019c61cfffb652bad327546a472c47731
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to 'kuzutuzo.ru', suggesting an attempt to redirect the user to a malicious site. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, which may be part of a lure or obfuscation technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=calage+distribution+206+1.1+essence
    • http://gotuxeloso.22web.org/lyman_shotshell_reloading_handbook_4th_edition.pdf
    • https://static.s123-cdn-static.com/uploads/4443809/normal_5fe277cb211ff.pdf
    • https://cdn-cms.f-static.net/uploads/4366044/normal_602d9e0326e03.pdf
    • https://roxoxadedetep.weebly.com/uploads/1/3/4/5/134520556/1098fb49d128e.pdf
    • https://timakopazasiri.weebly.com/uploads/1/3/4/4/134445807/4724918.pdf
    • https://cdn-cms.f-static.net/uploads/4379852/normal_603fde9909aaa.pdf
    • http://doroketosukuso.iblogger.org/cds_2020_2_question_paper.pdf
    • http://votexetoke.iblogger.org/o_capital_boi_tempo.pdf
    • https://pirusamu.weebly.com/uploads/1/3/1/3/131383726/2017062.pdf
    • http://fiselijuduguge.iblogger.org/suvufijetusemakikepuged.pdf
    • https://cdn-cms.f-static.net/uploads/4490140/normal_600ef8fcee060.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zatorir.epizy.com/relib.pdf
    • http://xidozex.epizy.com/ge_profile_microwave_light_bulb.pdf
    • https://uploads.strikinglycdn.com/files/79c467ef-a8b0-4815-8c14-a88aaf1d7db2/fujox.pdf
    • https://uploads.strikinglycdn.com/files/4c1205d1-4a84-4ce2-a4d1-2b0c048a7bf5/88126195602.pdf
    • https://uploads.strikinglycdn.com/files/1c41dd79-bb5e-49c9-b12d-f142be4b14d1/ketewosotumokimolu.pdf
    • https://uploads.strikinglycdn.com/files/4302ca09-385b-4c28-b64a-17ae0f345e84/singer_237_sewing_machine_review.pdf
    • http://jabulimoj.rf.gd/professional_football_training_program.pdf
    • https://uploads.strikinglycdn.com/files/a3daba5c-61ca-4370-8dbe-61ebf49e1a62/which_character_strengths_are_most_important_army.pdf
    • 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_off0000f469.bin
10c1c5f0e3fb5986dd28ef109e45e8827347837d93e70cd0f6b4482bd7e6271d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF469 5664 bytes
font_01_sfnt_off000107c1.bin
4d1b188db91a60c13fade98f8aa4e142744910837148a000fed303e96e018f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107C1 12880 bytes

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