Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe0f7bb0a1e6cd3…

MALICIOUS

PDF

78.2 KB Created: 2021-07-13 16:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d23c99bfbd8faf14aad2725c9f1c4c98 SHA-1: 504686f8cb95d99c746000b48b32382aa4d1f03a SHA-256: 3fe0f7bb0a1e6cd32376b18c10afdead6f3403c5efde8eca1b86e8f08c2285dd
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 high likelihood of malicious intent. The presence of embedded URLs, although many are marked as benign, suggests an attempt to redirect the user to external content. The document body is heavily obfuscated, but the overall structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6556

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/S-4CHg4Qmwo/square?utm_term=swagger+and+fitz
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed8829af55617121275761/1626179626200/who_is_audrina_patridge_dating.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec9461b3b63f0898f364b4/1626117217988/48736000167.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec9f15e0ada229be5965ae/1626119957603/23975578443.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_off0000d10c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD10C 16792 bytes
font_01_sfnt_off0000e923.bin
485b18487c1778fce777606888c26377c2482b6c94267b403d5bddbbad4b3558		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 10416 bytes
font_02_sfnt_off000100b9.bin
078a17a1626efa9e079a35120d209b2fc8825b02ac0e51a17e7ffa2aa3a1dc87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 17180 bytes

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