Malicious PDF — malware analysis report

Static analysis result for SHA-256 158948f7f09fb8dc…

MALICIOUS

PDF

76.4 KB Created: 2021-07-16 12:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0314eb2b328c1367539e9f7711e97d3e SHA-1: 860c3838428478c3257e0126bf6b51a5c8731fe9 SHA-256: 158948f7f09fb8dca1f0e3cf1287b447aa6b88aecb563aafba08f0439bab2f86
136 Risk Score

Malware Insights

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

The PDF document employs a social engineering tactic, presenting a lure to install a browser extension or update to view its content. This is a common method for distributing malware or stealing credentials. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7746

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://feedproxy.google.com/~r/sq/ugae/~3/k6oGaauGqGM/square?utm_term=how+not+to+write+a+screenplay+pdf+download
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8c72bc6eee4b058ec226/1626115186564/fundamentals_of_data_structures_in_c.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee33a0f6c772366d2d66c2/1626223520313/didujefijelonazusulifag.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec9009f4b4775d04a037b7/1626116105744/somers_town_estate.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f02df224fa75375d87313f/1626353138734/juremisapivupu.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_off0000ca32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA32 16792 bytes
font_01_sfnt_off0000e249.bin
18ace8e229dafb43d752883b1af2717d0a8aa09167b34507b98dcc6482af5986		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 10804 bytes
font_02_sfnt_off0000fb53.bin
ca4b0cc010d9a0334ee84895a0daea9b95c4ec109dd7a9b6f72d2f7dd4a1ffc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB53 16376 bytes

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