Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efc84296dde50b3…

MALICIOUS

PDF

74.9 KB Created: 2021-07-17 23:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc952d705034b41dbc17042551b1c864 SHA-1: 7a78919337441d6052acfcde64365c95bba3815e SHA-256: 0efc84296dde50b31cc44f1696ccfb996ad0fcefd950ab723431e50d4c180641
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The presence of embedded URLs, although marked as benign, suggests an attempt to redirect users to malicious sites. The PDF structure itself contains anomalies, and the authoring application 'wkhtmltopdf' is unusual for a malicious PDF, potentially indicating obfuscation or a custom exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7788

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=dunce+cap+meaning
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f02ce136870d1a2db972e4/1626352865406/49213949910.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efef1afdf156014349bb26/1626337051024/miteg.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f1264afcdff1298e55613c/1626416714771/rebekafupigaxivanebogefuf.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_off0000c5fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FC 16792 bytes
font_01_sfnt_off0000de13.bin
830dcab5ad1131a40b38a3e99eb2773f6f9ed008faf921ec4af46a1a3d7d0921		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 10288 bytes
font_02_sfnt_off0000f530.bin
c0c208fef04716c8f7ea463b9aa46c81143fc963ed6d21286707cae2dfd4065a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 16664 bytes

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