Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f1901c97bdb9a7…

MALICIOUS

PDF

78.1 KB Created: 2021-07-17 03:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 438ada2a9be0a9817e4890e7892e80a4 SHA-1: f73e2d33f2a72d9c34b4625fcffa01f4a2b23aab SHA-256: a3f1901c97bdb9a7d77f4a5d9eae0ae7c95ac1300ffe3145dab1d36a7dfe45af
96 Risk Score

Malware Insights

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

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 a potential phishing or exploit delivery mechanism. The PDF structure and the nature of the heuristics point towards an attempt to exploit a PDF vulnerability for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8439

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/qI_NY8u86tA/square?utm_term=calculus+early+transcendentals+8th+edition+solutions+manual
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60eded3c1c6c1a61d526a44b/1626205500440/download_song_tones_and_i_dance_monkey.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee6f37115d504d3a896600/1626238775539/wuvovovemuvedidofugojizur.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e92511defa333328aa9ffb/1625892113080/gripping_gaap_graded_questions_2019.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edeb3fd9d5ad70ebd3da30/1626204991574/62806718260.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f077783f5e7b0f5ec4905a/1626371960681/cute_outfits_for_gacha_life.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_off0000cfe3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE3 16792 bytes
font_01_sfnt_off0000e7f5.bin
89b10004583489460e2ea88ce813e17634c687622a03abf34012eaff3be7ad7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 16552 bytes
font_02_sfnt_off00011254.bin
1810c0b59c9e1c67c1969bc81d1766ebd14a3d1ff2ade0b339721f73a2538bf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11254 11088 bytes

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