Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a6258545dd04de…

MALICIOUS

PDF

79.5 KB Created: 2021-07-12 22:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd1fdae686ca19158589d086136209e4 SHA-1: 5e903dc6d1035aaf0c9977790a88e01134c9d999 SHA-256: c4a6258545dd04de973823907e3cd29f88193553f3ece49735fc044bac57f671
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. An external URI was found embedded within the PDF metadata, which is a common technique for phishing lures. While the document body is heavily obfuscated and unreadable, the presence of the embedded URL and the ClamAV signature strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier clean score 0.1551

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/mHcMeCcfVl0/square?utm_term=drawing+chair+conformations
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8169481ab8d1aa9e144fb/1625822868247/widobidapad.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_off0000d5ee.bin
308291a31e9ccd6a434037350f0e9b0dae88ec0b3975c82a91ab752e67fae764		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 16824 bytes
font_01_sfnt_off0001021c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1021C 16792 bytes
font_02_sfnt_off00011a33.bin
bfcf4dc82413b0843357b283ed4ed1a7a499694de35798e0a1af32cef97aa6d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A33 10692 bytes

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