Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8d83548946c9a3…

MALICIOUS

PDF

77.8 KB Created: 2021-07-17 17:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a21113c59a089c1d62dc26317f13933 SHA-1: 9fd1f2f7943cb36f099fe10539f5f2bdca8a8594 SHA-256: fc8d83548946c9a31634fe617e804abce8a6e55561881dfda7c37f291da5bc7a
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, even those labeled as benign, suggests an attempt to lure users to external resources. The file's structure and heuristic firings point towards a phishing or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7604

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://feedproxy.google.com/~r/sq/ugae/~3/5VO7y1TeAqQ/square?utm_term=signs+of+dysphagia
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f16b5b3d214e0c0784734c/1626434395473/how_to_quote_a_movie_in_an_essay.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e92905b68d8f0f4bf8889e/1625893125148/download_ccleaner_for_windows_10_with_crack.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f175006e9a9a494aa884c9/1626436864812/fire_mage_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://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_off0000d182.bin
7089b14a3eb636eebc58356d4cd36bda1e5cdafd7e786629afb3c69c6ecd159f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD182 10592 bytes
font_01_sfnt_off0000e960.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE960 16792 bytes
font_02_sfnt_off00010172.bin
8a8ae9171b03984ef17c095198ddb8d7df90a98e313a75570cac989d98b2d1f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 16416 bytes

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