Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9903e420a438d3…

MALICIOUS

PDF

73.7 KB Created: 2021-07-21 09:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 747aab761e37cbc0afa40eca927f1d71 SHA-1: 8ba391db9b6a09286b9c2fcb542400cc06be04a3 SHA-256: ff9903e420a438d3a57d91f13af24caebd8f21d25b6d82dc4de1d6b9a8ef7c38
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. It contains an embedded URI that points to a URL which, despite being labeled as benign, is likely part of a phishing lure. The PDF structure and embedded objects suggest it's designed to trick users into visiting a malicious site, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.1822

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/~3/4P1vZUbBa90/square?utm_term=modern+digital+and+analog+communication+systems+4th+edition+solutions+pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ede28bcb43530604a880a8/1626202763737/57211592966.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_off0000bc0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0E 16792 bytes
font_01_sfnt_off0000d420.bin
e01831c26a4559492aecaac84cd0413161b90580d3d96b4d4a773afba9d223cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD420 16796 bytes
font_02_sfnt_off0001002d.bin
132e3da49941b43c305e4767b561d4469ab66c1f1889ccff8981ea7be2df6fc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 11352 bytes

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