Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc31f4f0ca3e691…

MALICIOUS

PDF

78.5 KB Created: 2021-07-17 15:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e740cbf1246bce9cf9c7d9140178ebb SHA-1: 3f752d78e1daadf664498f135530040cca427f20 SHA-256: bbc31f4f0ca3e691fb207057720ac7e7618b75a8424cb67952d18465c872699b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to external content. The wkhtmltopdf authoring application and the nature of the embedded objects point towards a crafted PDF designed to exploit vulnerabilities or deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8755

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/UkUWPC8UKDU/square?utm_term=jerk+off+with+other+men
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f113a2ff43f805445165e3/1626411939020/simple_indices_worksheet.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee868b114e6b7b7deac324/1626244747258/how_to_save_as_jpeg_for_free.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f24198bb7e64222ded349c/1626489240296/31577010557.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60eded98afeffb59e67386c0/1626205593055/wuvoxexapekitixebeda.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e86e08ba7b104dfc0a4eb1/1625845256872/funny_answers_to_how_was_your_day.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed90799db072196a240f12/1626181753852/21720268092.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8e452db8bb141bad637ab/1625875538731/timaduwowuzuk.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_off0000d289.bin
d2dbf7b8e9c65fcc95989cbdf0c7c75d7080ea3f3cff753705703b12ac6d1382		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD289 17140 bytes
font_01_sfnt_off0000ff5c.bin
405805c27fd4a26b0b0f942f7b660bfd43c298bd78b26f27612cbd78749d8ba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5C 10272 bytes
font_02_sfnt_off0001165a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1165A 16792 bytes

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