Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84434cde4b82068…

MALICIOUS

PDF

74.8 KB Created: 2021-07-19 11:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61a753990e37ab2939359106505afa1a SHA-1: cdba76bee25c1ad38a7c97fde09a0c1ba616da8d SHA-256: c84434cde4b82068c8ae35cf95287accaaf60824bd5370204250f8bb70722401
96 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to a malicious site or download a secondary payload. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/qI_NY8u86tA/square?utm_term=an+acute+angle+measures+between
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0b2772c92ee1dddd6d73f/1626387063407/fuziwegavuxajudume.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee44921f51426150cd8960/1626227858863/57843933000.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e928288fb24157da70538f/1625892904964/red_dead_redemption_strategy_guide.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e796acb977dd1475c5cc1f/1625790124673/66017727788.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f3b0ce32548145d78eec5d/1626583246442/grep_to_find_text_in_a_file.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60efe07e54c38e1eb645f754/1626333310686/conditional_group_by_sql.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8fd61aa30721e65ed8f3d/1625881953573/87140817399.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_off0000c34e.bin
36019e4de8c3c6b00ad8a4cfd0f82370a9f8b5b59fb15aad7d1d703f6c460e18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC34E 16620 bytes
font_01_sfnt_off0000ee98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE98 16792 bytes
font_02_sfnt_off000106af.bin
27d68a1c4a154ac1476234ab97b1e7c25655dae433717111c45274fd5ebf1e37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 10668 bytes

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