Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a0299a3a004666…

MALICIOUS

PDF

81.3 KB Created: 2021-07-12 21:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4543beb05db5e9734becc93634352ffe SHA-1: b62296cb1314216b66965e2be62250cd00c1c569 SHA-256: 13a0299a3a0046662bee13cdb1f9092bb7b7f841d8bbaf1f563574b0f5b6964e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect users. The PDF structure and heuristic firings point towards a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6166

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/razvivatel/yapz/~3/UQ8tT55rDuk/square?utm_term=blood+type+punnett+square+practice+answers
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec88870cf33f708d7aeffe/1626114183942/93688685250.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8b040f98f4246de4060e5/1625862208270/48418724418.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8c1705183b3b579dca91/1626115095243/9332205800.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e94c9b025aa46e30d42fb6/1625902235492/black_and_white_fly.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_off0000da87.bin
8556a9e72f4c53e3db35a9710a2c127a6c4fa3d1a45a731af7b8defd17ae7479		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 17124 bytes
font_01_sfnt_off0001075d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1075D 16792 bytes
font_02_sfnt_off00011f74.bin
e6bfe31054aa9077d6e4247e4d817e1d8a1b147f378cd5accc670c40930b0e1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F74 11004 bytes

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