Malicious PDF — malware analysis report

Static analysis result for SHA-256 908436319d843fae…

MALICIOUS

PDF

73.2 KB Created: 2021-07-18 03:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23bba0f525adc8d86d06aadd76f0afc9 SHA-1: 9d4e46164755ae9c0b40f6bfdcffcfaf16f30675 SHA-256: 908436319d843faee9605524afe07e5d07ba32d23a0be3528c93756433abcf4e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains embedded URLs that point to external resources, suggesting an attempt to redirect the user to malicious content. Although the document body is heavily obfuscated and unreadable, the presence of these URLs and the ClamAV detection strongly indicate a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.1558

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/razvivatel/yapz/~3/0YvHz_IItD0/square?utm_term=download+last+10+years+cbse+10th+board+papers
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edef2a24c32e4364b63293/1626205994490/wijona.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee16797dee9f188f7597ee/1626216057590/surface_rt_update_to_windows_10.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_off0000b9f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F0 16792 bytes
font_01_sfnt_off0000d202.bin
5ff73e7f427d5c06c18108cb682490ebe50c46f1266b1ade0315baf2f48fe4f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD202 16696 bytes
font_02_sfnt_off0000fd40.bin
ae0f723fae510abdd53338a5ff0135e9c76596eafef37ae399c196d72d4fde26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 11036 bytes

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