Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9b27ff7d005cbc…

MALICIOUS

PDF

73.7 KB Created: 2021-07-15 22:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8c6eedc07d1d54b43f41c92ac9dd897 SHA-1: 623598aaf6607156cfe355eecdd396133dfa7aba SHA-256: 0c9b27ff7d005cbc62af5c908e38e4df11ca40ecd46d72941d57a1ab3e458103
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a PDF with embedded URLs, and ClamAV detected it as a phishing trojan. The embedded URLs, although some are marked as benign, suggest an attempt to redirect the user to external sites. The PDF structure and embedded content indicate it was generated by wkhtmltopdf, which can be used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2686

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/UQ8tT55rDuk/square?utm_term=what+is+the+meaning+of+recycle
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f0571b7affba70db7d98c0/1626363675831/american_stafford_puppies.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60efd78bb3de5a36b12517ae/1626331019775/project_4_fourth_edition_student_book_free_download.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_off0000bfb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB2 16792 bytes
font_01_sfnt_off0000d7c9.bin
24b10616e79c2740fb4c5dd7992da60781dd30a110c8da3106998205ee6fba16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 10892 bytes
font_02_sfnt_off0000f0d8.bin
9fc3c08116af5ebd6161c8eb3a20519499a91420928a3abece9e9d7262f46e42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 16488 bytes

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