Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ddba52b1580cd0…

MALICIOUS

PDF

79.0 KB Created: 2021-04-15 20:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45df9fffa9e730e306d90d5e8dc175ed SHA-1: 99c6efcd109b907ad67a09c34dd26110a3674d8d SHA-256: d8ddba52b1580cd0fbca29c1fb24ac15d5e2c62380c58c19a03aa79d7c2a0ba8
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious. The document body, though truncated, contains text related to installing Windows 7, and a heuristic indicates it contains an external URI pointing to 'jumiwimov.ru'. A critical heuristic also identified a 'Clipboard command execution lure', suggesting the document instructs the user to copy and paste content into a shell, likely to download and execute a second-stage payload.

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://jumiwimov.ru/strik?utm_term=how+to+install+windows+7+step+by+step+using+usb
    • https://cdn-cms.f-static.net/uploads/4490001/normal_5fd5fa6c7c4b2.pdf
    • http://pisufixefonof.scienceontheweb.net/data_structures_and_algorithm_tutorialspoint.pdf
    • http://lorakuze.sportsontheweb.net/seamus_heaney_poems.pdf
    • https://cdn-cms.f-static.net/uploads/4426423/normal_606deb3b6cc03.pdf
    • https://static.s123-cdn-static.com/uploads/4425217/normal_5ffb77c829fe6.pdf
    • https://cdn.sqhk.co/xewafazuk/hRjdQjj/supplementary_angles_definition_geometry.pdf
    • https://cdn-cms.f-static.net/uploads/4379359/normal_604b783a994cd.pdf
    • http://zisuroto.mygamesonline.org/nabepoluzebaxibokaw.pdf
    • https://static.s123-cdn-static.com/uploads/4411915/normal_5ff247b6e235c.pdf
    • https://static.s123-cdn-static.com/uploads/4481163/normal_5fe02d104da32.pdf
    • https://static.s123-cdn-static.com/uploads/4405652/normal_5fe4f6e2d1bfb.pdf
    • https://cdn.sqhk.co/zojafatowulu/aGFhjsQ/rally_legends_rc.pdf
    • https://cdn-cms.f-static.net/uploads/4492586/normal_60621e10edf7c.pdf
    • http://mimivamefigupe.sportsontheweb.net/alphabet_practice_worksheets.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_7a120e0333a24ce2a1f7617380aa1126.pdf?index=true
    • http://luvetux.myartsonline.com/lumez.pdf
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_20087ef6281842c5bf97baec21d89e3f.pdf?index=true
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_44234f7069184a29b3c805274a39a28a.pdf?index=true
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_0e294a4e06844c88b90b5c1a364e49d1.pdf?index=true
    • 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_off0000f708.bin
88a479988756d43cb19549f960456c19c927f8cf1a21b25e50f2d0721fb2cbb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 5408 bytes
font_01_sfnt_off00010999.bin
26ea585471a11148bc9fce6ff1623402c4f8edbb6cd7a200b426352725cfda0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10999 10944 bytes

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