Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8db257b8e8cf784…

MALICIOUS

PDF

80.1 KB Created: 2021-07-16 00:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36319e93b4d1aea8890908da3992bbcb SHA-1: 0282a3094f6a049eb70e6dc3d92e734c3ca9a9cd SHA-256: b8db257b8e8cf7841f62ae50d928bf6616956b4e121bad3563e19265df41acd4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. The presence of embedded URLs, even if some are marked benign, suggests an attempt to redirect users to malicious sites or download further payloads. The document body is heavily obfuscated and unreadable, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9031

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/~3/1LSSs5qy-i4/square?utm_term=sbi+solved+papers+for+po+pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ede7729779423221e0e35d/1626204018637/electrotechnics_n5_question_papers_and_answers.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f043b95d627c4551e6541c/1626358713948/jatotataterubavo.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f06e694bddb81875f0e7b2/1626369641645/65801738407.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ecaa803631fd4ab81a0052/1626122880384/21741187515.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee1a0ea005482cc15392a2/1626216974295/54454866550.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edaa41c8312e4ee1df9698/1626188353426/the_sunset_limited_meaning.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f01a5b38a0fc3ca969d345/1626348123281/5542268297.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_off0000d879.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD879 16792 bytes
font_01_sfnt_off0000f08b.bin
e8da6f411d07745266e4ef54eae113f240c80e9d9f2940af908165e48c26445c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 16892 bytes
font_02_sfnt_off00011c93.bin
b2f6ef5543080e484263e1c916e395d59b307cad07f32ae62ab063143e1925b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C93 10568 bytes

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