Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfeb9e2c4bac226b…

MALICIOUS

PDF

81.9 KB Created: 2021-07-20 19:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77a557895456c9442ecad0a9ca9dc6ed SHA-1: 59603e6711fba925dc3ef1ced6f081131a9360be SHA-256: dfeb9e2c4bac226b62d389f50184d07072033ebb2a4d0964cff452753311ab25
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect users to malicious sites or download further payloads. The PDF structure and the wkhtmltopdf authoring application are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6221

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/CHqDoFjlE84/square?utm_term=introduction+of+natural+language+processing
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec85a8a3e9df788e6d9de4/1626113448954/xeloruza.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f0c6a906e5cb5c825f5975/1626392233948/kigolasa.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f19eca820bb64206429df0/1626447562619/strong_field_ligand.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_off0000e064.bin
5ed186746563810af45b74596b2ccd50465f9b82746abe6cc2f6bf4c2578e756		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 16352 bytes
font_01_sfnt_off00010aed.bin
33943afcb6d2b2376bfa8971800df30d4225042202246ed7563322139b82d129		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AED 10848 bytes
font_02_sfnt_off000123df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123DF 16792 bytes

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