Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc5f4a6e38349aa…

MALICIOUS

PDF

80.8 KB Created: 2021-07-16 22:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25ddc653ba64a4c3f2c0dbca42c3d655 SHA-1: 6784a4834ba68fec3e1e04741e9ad83795a0eaed SHA-256: fbc5f4a6e38349aa320f75bb79716c409404ef66ad434e3d066778a551d351dd
66 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan, indicating a malicious intent to deceive users. The presence of embedded URLs, although many are marked as benign, suggests an attempt to redirect users to malicious sites or download further payloads. The PDF structure also shows signs of manipulation with duplicate object bodies, which can be used to hide malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.1467

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/AG-UZpNbJGc/square?utm_term=general+principles+of+ethics+in+psychology
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f13b8bfe1af12ac2c47098/1626422155494/my_son_is_a_fanatic.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee1aaff6c772366d2b55cd/1626217135528/gamonerifamigez.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_off0000df37.bin
9c8f66082f6b782c9de177dab7d0be24ea936c8e6daef842f52c034ef8deacbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF37 10912 bytes
font_01_sfnt_off0000f877.bin
f9e3e08c8f1e4b1e4c36872287042c3dea3d158dc11793dbb38b505a9b168d14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 15468 bytes
font_02_sfnt_off00011f8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 16792 bytes

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