Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d79efb116629d2…

MALICIOUS

PDF

81.1 KB Created: 2021-07-14 04:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c024db47c0c6a292a62a91712b9ece13 SHA-1: 677e2ca031a3440bfec1dd685e854fe1b654ff65 SHA-256: f2d79efb116629d2768e05bfd80285e82856cfc8791b0a6a2c090a67793f67d9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs suggests a phishing or redirection attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8298

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=joint+and+conditional+distributions
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ede7b3c6126f45c3e2e134/1626204083671/letter_of_intent_to_sale_property.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e819d4b977dd1475cc8bf2/1625823700659/42559316265.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e93aa4c22c005c93398234/1625897636565/50243992087.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ecab4045711547b6aa2fe4/1626123072575/195_pounds_in_kg.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7f6bdfdc75e32ab08a1f9/1625814717629/18567462717.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_off0000da59.bin
25fc8d27b32b6991358dd27ee4088318bafbd36cf38620e25148645fb22df7e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA59 10460 bytes
font_01_sfnt_off0000f233.bin
580fcd1d60e14af11d04375e4a08d70056d3fd9e25a08bab5a556b2388502e91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 17608 bytes
font_02_sfnt_off00012077.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12077 16792 bytes

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