Malicious PDF — malware analysis report

Static analysis result for SHA-256 d05481c3bbb57ca1…

MALICIOUS

PDF

81.1 KB Created: 2021-07-15 22:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8c7f4a998b7d29835372cc81854b042 SHA-1: 39c00e5b50e2738992f375dba2616ad329aa2d7c SHA-256: d05481c3bbb57ca183bdc146c56b45f31aaf978276ee250742d98bf21a708e1b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure the user to external resources, potentially for phishing or further malware delivery. The PDF structure itself is suspicious due to duplicate object bodies, and the authoring application (wkhtmltopdf) is unusual for a typical user-generated document, further supporting a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8298

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/AG-UZpNbJGc/square?utm_term=folk+dance+meaning+philippines
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee8db12af4c01978011301/1626246577633/67272496214.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8f42cf107ff2467e7183d/1625879596949/94080231562.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ede60a6f118478735ce008/1626203658312/hinge_designed_to_be_deleted.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f01239e00eb31d7cee4b6d/1626346041401/15117533786.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee264f537273346e2df7a3/1626220111322/67537305689.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_off0000dee2.bin
eb2fc30e5307744a53affb421be9ef9c5577f45ba58b0714f38996ca5c78d9e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE2 15980 bytes
font_01_sfnt_off000107dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 16792 bytes
font_02_sfnt_off00011ff3.bin
bee15603df495acd773279cf5ebcf70e0e4f06a971c97e8e4733ce31c10fca64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 10832 bytes

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