Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f25fb8193fa69d…

MALICIOUS

PDF

75.2 KB Created: 2021-07-14 06:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b63662445e261e267c1cb1df17784f8 SHA-1: 8dcc65c6228f83a93aeefe34976784866f341333 SHA-256: 91f25fb8193fa69de288c71bd68ef357d02b9e1a8e30baadf5436c818e3ebe7e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or redirection mechanism. The PDF_URI heuristic firing also points to the file attempting to access external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7788

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/k6oGaauGqGM/square?utm_term=fee+paid+definition
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee5bd0537273346e31bd25/1626233808364/96787908331.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e93a62db8bb141bada32f1/1625897570240/16146382201.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec8f5436ee212f66cf6cba/1626115925195/david_by_michelangelo_meaning.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_off0000c826.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC826 16792 bytes
font_01_sfnt_off0000e038.bin
d61ecbf45229aad86eeb8345fd16fd3d867875546d608c4d141c15354088a9b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 16256 bytes
font_02_sfnt_off00010a52.bin
d370233f86c5fe14d9540dd3147794ad07d6b4a4d1719577f3128369ead10ebe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 10156 bytes

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