Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aac615f70005ed9…

MALICIOUS

PDF

72.8 KB Created: 2021-07-15 18:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30abd45d118744ed3efe36679b828587 SHA-1: c8519e4649c62d9ff29a5e23cc1b718f936cd24f SHA-256: 8aac615f70005ed91c001b91cbf5282fc1f7c7d310a74e8fc8915be630a8a566
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. The embedded URL, though marked as benign, suggests a phishing or social engineering lure related to a 'private car rental agreement'. The presence of PDF-specific heuristics indicates potential exploitation within the document structure. No scripts were extracted, but the overall context points to a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6403

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/hIkXU_AiHkM/square?utm_term=private+car+rental+agreement
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ede84eebcbe27d0c7ee849/1626204238888/61477455316.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed8dfcdacdbe35d62ba591/1626181116557/gozawokaw.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7c6154a52c186ce43442/1626111073236/numerical_analysis_timothy_sauer_solution_manual.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_off0000bc9b.bin
737124e7cf9346ddf10ab9c0e5183bf158c227a81aaab5709b0c220b7ade112c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9B 10352 bytes
font_01_sfnt_off0000d3f6.bin
d179b547375caacf4dfddf6782bb7b27c838542bd8c116da3c377b8deecf3a68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F6 16704 bytes
font_02_sfnt_off0000ff73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 16792 bytes

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