Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7dac4fe1ee7aefa…

MALICIOUS

PDF

69.1 KB Created: 2020-12-22 17:07:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 761cc267c764c8701c16ccf2d22328f3 SHA-1: 1b236b5788e8cc06e76a3f63ba444e06b4b75530 SHA-256: b7dac4fe1ee7aefa9700851d126811421869cabb03d6d9f1acde569b9538e369
136 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it uses a social engineering lure to trick users into installing a browser update or extension. The embedded URL 'https://traffset.ru/strik?utm_term=online+3d+home+design+software+free+download' is likely part of this lure, potentially leading to a malicious download or credential harvesting page.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://traffset.ru/strik?utm_term=online+3d+home+design+software+free+download
    • https://cdn-cms.f-static.net/uploads/4380691/normal_5f9329527f671.pdf
    • https://static.s123-cdn-static.com/uploads/4446759/normal_5fc3d87008a49.pdf
    • https://static.s123-cdn-static.com/uploads/4416789/normal_5fca39f99d2d5.pdf
    • https://cdn-cms.f-static.net/uploads/4464739/normal_5fb2d39f7764a.pdf
    • https://cdn-cms.f-static.net/uploads/4483337/normal_5fc2ad4c7838d.pdf
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5f89a6ff8c9a0.pdf
    • https://cdn-cms.f-static.net/uploads/4482405/normal_5fdb277d0e709.pdf
    • https://cdn-cms.f-static.net/uploads/4409421/normal_5fda8436c140a.pdf
    • https://static.s123-cdn-static.com/uploads/4418570/normal_5fcdc7fe830bf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mafavuzenoliki/ball_journey_mod_apk_hack.pdf
    • https://uploads.strikinglycdn.com/files/8d08b3bd-5b63-47b3-8979-d18d9661c061/86176618150.pdf
    • https://s3.amazonaws.com/zetare/bosquejos_de_sermones_tematicos.pdf
    • https://static1.squarespace.com/static/5fc0187aa5bc066edfa15e28/t/5fc13e867acac6192aee3dbc/1606499983863/60318047564.pdf
    • https://s3.amazonaws.com/gelawiweza/bissell_natural_sweep_how_to_empty.pdf
    • https://uploads.strikinglycdn.com/files/605504c3-00a9-4694-8372-4916592b7558/rathalos_extreme_guide.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_off0000d043.bin
a8c3b501fced11ea5e20f2a309ad538ac13d89652f22f56b92def472db77e56e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD043 5604 bytes
font_01_sfnt_off0000e338.bin
be46f5798e337e1879a6b618868aa636f1dc90efac50fb779a07eb04235db2e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 10632 bytes