Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f0ece0ef242a22d…

MALICIOUS

PDF

76.3 KB Created: 2021-07-16 05:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b33c2ed65236c601d24db00ff1cf713e SHA-1: 1e14ec6ff61a405bfb93dec3e1364148e726d25e SHA-256: 0f0ece0ef242a22d9d1b5be7ba96fea6efdf00a4619164d0b7a58e420e20c8b5
96 Risk Score

Malware Insights

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

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. The PDF structure itself contains anomalies and the authoring application (wkhtmltopdf) is unusual for a typical document, further supporting a malicious classification. The exact exploitation mechanism is unclear due to the lack of readable document body text, but it likely involves exploiting a PDF vulnerability to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7703

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/~3/1LSSs5qy-i4/square?utm_term=coc+town+hall+level+3
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f064f3fa9d7013435ce733/1626367219812/22699926828.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee8b98eed6cd77ab660d78/1626246041082/causal_agent_of_typhoid.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec920f7d354a5e86a4181d/1626116624095/koxuxunigevoraxaw.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_off0000cacc.bin
d480f563c69c5a483471202576cf8be64013f55fc5bf13fe1e5bcc6d19243a0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCACC 16708 bytes
font_01_sfnt_off0000f63a.bin
b19d7bf1a640ea60b22c0ace3a3e5f1073483cee4b71a1b6e2e33663f645c13e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 10324 bytes
font_02_sfnt_off00010d94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 16792 bytes

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