Malicious PDF — malware analysis report

Static analysis result for SHA-256 25314f33f72e0191…

MALICIOUS

PDF

371.3 KB Created: 2015-11-07 02:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.2.4 (via Qt 4.8.6)
MD5: eecbb5b054708bdc1981dcd803b91f87 SHA-1: 9475ffb99a6b090629108798297a0d15354d98e9 SHA-256: 25314f33f72e0191a9bd68ac3940855380d83480c8f95da2e40f689b3c7db0c4
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The file was detected as malicious by ClamAV with the signature Pdf.Dropper.Agent-7866964-0. A heuristic also identified an external URI pointing to 'http://taurus-tg.ru/'. This URL is likely used to host malicious content or redirect users to a phishing site. The ML classifier also flagged the PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 3

  • ClamAV: Pdf.Dropper.Agent-7866964-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7866964-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://taurus-tg.ru/?nnr&keyword=starlight+3+teachers+book+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BE&charset=utf-8
    • http://media.nn.ru/data/ufiles/2015-11/6d/b5/0a/563c6409ae0c4_matlabskachatbesplatnonarusskom2013torrent.pdf
    • http://media.nn.ru/data/ufiles/2015-11/4e/e0/c7/563ca0be6b98a_draiveranaprinterhplaserjetm1132mfp.pdf
    • http://media.nn.ru/data/ufiles/2015-11/61/5e/94/563cfdeb9edee_diagnosticheskaiarabotapomatematike7klassstatgrad.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0005831b.bin
7ea6bb96e6c2825849218659eb88662734479fd1eb6cf7b20af1a2738f03a59f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5831B 9764 bytes
font_01_sfnt_off00059df1.bin
f9d01e1301073c3bffa8c49e415ae942e93a09ac29d7f6b3e752f2e8dc77a75d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59DF1 15876 bytes

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