Malicious PDF — malware analysis report

Static analysis result for SHA-256 b717ad3ffe16646b…

MALICIOUS

PDF

72.3 KB Created: 2021-07-16 12:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0884e9a885daeaa9c5612d83e04c8048 SHA-1: fd5151f43abeb915ca7e78928d22e8c097a8f12d SHA-256: b717ad3ffe16646b2a9f409e643d5229a0cd33baee518504afe20588bee872c2
136 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains an embedded URL pointing to a suspicious domain, which is likely part of a social engineering lure to trick users into installing malicious browser extensions or updates. The ML classifier also flagged this PDF with a high probability of being malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8216

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/square?utm_term=zombs+royale+online+game
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e9388c566ded7d61ad81bc/1625897100330/a_far_cry_from_africa_summary.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f112c1e75c7a046d9bb7f6/1626411714014/35087611835.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8ce9a6f0e2d629ec07cdc/1625869978595/the_delhi_sultanate_a_political_and_military_history.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f0f21646c0d74f87dc3b2d/1626403350685/66571413325.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f00c395d627c4551e2e3b2/1626344505540/lijiko.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB9 16792 bytes
font_01_sfnt_off0000d7cb.bin
bb7e34517c49c01301e48f99ee90318e19291d3e969b709d9e1921a3f5451f48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 14876 bytes
font_02_sfnt_off0000fd51.bin
ea36f2553413a295a718879b802e5c5f49b29b16446482041bfa34243865a3f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD51 10568 bytes

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