Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ebe87493825d43…

MALICIOUS

PDF

74.8 KB Created: 2021-07-13 16:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b717ebfc4b4a43b7cd0bff2e7ba3ad37 SHA-1: 2c7e1a76c0596f455671c17671435133c5a3876a SHA-256: b8ebe87493825d4317ad50d3eebf5f31122d61be236e293cc13c52fad89eb147
66 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan, indicating malicious intent. It contains multiple embedded URLs, some of which are associated with legitimate content, but the overall context suggests a phishing or trojan delivery mechanism. The PDF structure also shows signs of manipulation with duplicate object bodies, which can be used to hide malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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/XMoLd4EPXkg/square?utm_term=pressure+ulcer+meaning
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e93831b9b95949b65f7cb3/1625897009756/43373488829.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e9572eb9b95949b6605bb9/1625904943084/34644658382.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_off0000c8a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A8 16792 bytes
font_01_sfnt_off0000e0bf.bin
21244ee797cd3e6a47c9984500ae7e075a048206a39d6ef657bd46f708b5d2a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BF 10456 bytes
font_02_sfnt_off0000f86f.bin
9cf31f21d45f6b43defe7adb29c4b51df47ddb9d092b12407e0d06b8e578df6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF86F 15488 bytes

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