Malicious PDF — malware analysis report

Static analysis result for SHA-256 7813b8bb793d55e3…

MALICIOUS

PDF

104.4 KB Created: 2021-07-12 23:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bc81c2638f691c2473763caef205166 SHA-1: 48fbe8da64de61104bbe1166c2b3bf2e4b9b57f7 SHA-256: 7813b8bb793d55e31707190c2df8da4961e9ec4d45a90a10bd63587f65b15fca
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 a malicious intent. The presence of embedded URLs, although some are marked as benign, suggests an attempt to redirect the user to malicious content or download further payloads. The PDF structure also shows signs of manipulation with duplicate object bodies, which can be used to hide malicious code.

Machine Learning

  • Nyx PDF Classifier clean score 0.1093

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/AnJPYMJXbyQ/square?utm_term=pokemon+fire+red+leaf+green+gym+leaders
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8bda137c4677c34614ba0/1625865633163/kapopojufemunomijibokug.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8eb3be6a58043b68ef349/1625877307144/rimexikesavovavewumuzijo.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_off00013985.bin
9b5dd0b6f763212e0e41d7d1dabae1f1493d1ebe76a0ab3b7bce05b27af0d478		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13985 16836 bytes
font_01_sfnt_off00016543.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16543 16792 bytes
font_02_sfnt_off00017d5a.bin
30b9c32505bd909401713bd0cbd4f21bbd36fbd311a820bfb78d12cd069de02a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17D5A 10804 bytes

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