Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb23186bcbce4ee9…

MALICIOUS

PDF

73.8 KB Created: 2021-03-11 00:13:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 668d62e15381abe04bfaefbbc1a445b7 SHA-1: 165db9dbf4fff20674857e584b47c3efd24f6c73 SHA-256: cb23186bcbce4ee960ee15faabc866fc16267f7a37e5f90ffa69f9edabc9c474
96 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 a high risk score. It contains an embedded URL pointing to 'resalured.ru', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, suggests a lure related to a 'worksheet'. No scripts were extracted, but the PDF structure and embedded URI are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/123?utm_term=hyperbola+practice+worksheet
    • https://static.s123-cdn-static.com/uploads/4450158/normal_5ff95e00ecf12.pdf
    • https://static.s123-cdn-static.com/uploads/4495686/normal_5ff4eab883fd5.pdf
    • http://pakirekugep.scienceontheweb.net/xadiwokaxotizikozar.pdf
    • https://cdn.sqhk.co/dasisogi/doYnifH/collage_maker_iphone_app.pdf
    • https://static.s123-cdn-static.com/uploads/4415767/normal_5fe472912928a.pdf
    • http://nopotaz.medianewsonline.com/definition_of_growth_and_development_in_psychology.pdf
    • https://cdn.sqhk.co/feguzuvubut/9Jzgdia/losobe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://molodetagako.epizy.com/fejowigi.pdf
    • http://dowulutidapewu.epizy.com/accelerator_driven_system.pdf
    • http://gakajitaju.atwebpages.com/how_to_add_radio_button_in_wix.pdf
    • http://kofaxafogi.myartsonline.com/23840078249.pdf
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_417f622bd062408395e4763f92feeb65.pdf?index=true
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_4228078623d546caa86ef45265ff06ab.pdf?index=true
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_71d298bf14df45e991d48a1770fcdb10.pdf?index=true
    • http://sotewupuwen.epizy.com/vutunasatururefisejokod.pdf
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_4c5657656bb04ae28f47a9db9e53eb4c.pdf?index=true
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_6e3cbba755c64203a8f4abf04d4e18a2.pdf?index=true
    • http://bazokupakem.epizy.com/befuvudedonumizagune.pdf
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_9d293269c5404cd7aa1c0ef133a37281.pdf?index=true
    • http://wufikemofumop.atwebpages.com/6.0_powerstroke_oil_cooler_replacement.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_off0000e46e.bin
48c5ce1365338d21b9b028de2c22d56226b659fb90e034a2243840f1fceb2ab6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE46E 5380 bytes
font_01_sfnt_off0000f6c2.bin
ec82e57cd43107b10ce03e6726d069ec657da1dc14d11dcaa056622befa0ac5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 10320 bytes

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