Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1237d4ce515d9fa…

MALICIOUS

PDF

75.8 KB Created: 2021-07-16 02:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 906f13f95050de8d56bb40aede32bb89 SHA-1: 55b7e6e1765aa2d125a71c9a6f89a1550bc3cc55 SHA-256: b1237d4ce515d9fa556d08ec85a67e5de0ef857dd20d994d51d82f16c4dd719f
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. The presence of embedded URLs and the PDF structure suggest an attempt to lure the user into a phishing scenario or to exploit vulnerabilities. While the document body is heavily obfuscated, the heuristic firings and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.1751

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=the+relative+permeability+of+a+ferromagnetic+material+is
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8b421f0e3534f504b8b5d/1625863201394/footnote_and_citation.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_off0000c62a.bin
2c3b8ce0be804e7cba8623c9074ff207b7a1cab4ad2228d9e1627bf15132ca16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC62A 17180 bytes
font_01_sfnt_off0000f122.bin
93d8c1ba83e048176488a30fa519a21787892400ae96979cb79dbd46d23cc4a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 11208 bytes
font_02_sfnt_off00010b09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 16792 bytes

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