Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfce34369f628a24…

MALICIOUS

PDF

134.0 KB Created: 2021-07-12 23:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aaab486bcb923a968e287398e9ecaf21 SHA-1: d968e4a7201bac0af510c9c0c4037c673b7c9721 SHA-256: bfce34369f628a24cfbb7276fd4c7e8e51f7f8aeba315013a1dd85e0d71f1929
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV heuristic identified this PDF as a phishing trojan. The presence of embedded URLs, even those initially flagged as benign, suggests a redirection mechanism. The PDF structure itself is unusual, generated by wkhtmltopdf, which can sometimes be abused to host malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier clean score 0.0648

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/WVKuihPcy9U/square?utm_term=ways+to+stay+looking+young
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8e2c7085b1c120f9461b5/1625875143797/wibirazakosodobajamoju.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec8bd0af807f1e1525fa9f/1626115024662/assassins_creed_4.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_off0001abfc.bin
b3b8444594a12f0cfa5c660182010c566c8aa4f77040da2cf83fcec89d5cfdcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABFC 18740 bytes
font_01_sfnt_off0001dc8d.bin
348449303b69f2a5b6916df9d5d0054ef8cdda8ac5f1333a6fa706f53b32aab9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC8D 10352 bytes
font_02_sfnt_off0001f419.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F419 16792 bytes

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