Malicious PDF — malware analysis report

Static analysis result for SHA-256 9632ad3755c86d36…

MALICIOUS

PDF

72.6 KB Created: 2021-03-21 04:22:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6c751692683ec6ac21afdbfe72ea70a SHA-1: bef27a0674811c4c934877a47effb03c6b2b839b SHA-256: 9632ad3755c86d3650b552cff587675f62290b9c271c38224769437b59771412
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to a suspicious domain, 'kuzutuzo.ru', which is likely used to host phishing content or distribute further malware. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to appear as a legitimate document, likely a walkthrough, to trick users into visiting the malicious URL.

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/wix?keyword=trapped+wayne%2527s+chamber+walkthrough
    • https://cdn.sqhk.co/zasokolof/p2hghi7/rotofegeruraganeraxumus.pdf
    • http://doxedisipi.scienceontheweb.net/96980111231.pdf
    • http://remoliwagofaju.mywebcommunity.org/crear_diagrama_de_clases_online.pdf
    • https://cdn-cms.f-static.net/uploads/4379046/normal_601fab819c51e.pdf
    • https://cdn-cms.f-static.net/uploads/4376858/normal_5fe988a22b007.pdf
    • http://monufovaxuj.66ghz.com/jasanuvileguvo.pdf
    • https://cdn.sqhk.co/kuwusemob/Cnjdbf2/international_marketing_notes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rususekobijo.myartsonline.com/nadunijopejozaluwir.pdf
    • http://xanojeja.rf.gd/ketosis_meal_plan.pdf
    • http://xuvafinuvewabek.epizy.com/53816552133.pdf
    • http://padegijogul.atwebpages.com/solving_equations_with_parallel_lines_and_transversals_worksheet.pdf
    • http://sopexalibip.onlinewebshop.net/eureka_whirlwind_lite_4388_manual.pdf
    • http://tobikinos.onlinewebshop.net/86015875214.pdf
    • http://zonatitusajobo.onlinewebshop.net/miller_spectrum_375_replacement_torch.pdf
    • http://xigurig.rf.gd/budomaguzirarowivipilot.pdf
    • http://vakifavu.onlinewebshop.net/11885302211.pdf
    • http://ribaxekag.epizy.com/feluvaxepasagolaxejozukik.pdf
    • http://wozunitififut.epizy.com/5918812933.pdf
    • http://fopupasefe.rf.gd/duwidefe.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_off0000dbf8.bin
6183d96563cba64b8507aecf33a61834753f267293ad4ae70cd13103d793c2e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF8 5868 bytes
font_01_sfnt_off0000efe0.bin
7562ecd21325df3eb7b57fcb0ed0da4fbd6285627ebbc440386009462008d504		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 11788 bytes

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