Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25845554affe67c…

MALICIOUS

PDF

74.2 KB Created: 2021-07-14 03:39:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97ac98a719fdc1d6be3ac1c933c351f8 SHA-1: 6773c7cf4518b63120a2af4c186ce9aaef3890f7 SHA-256: f25845554affe67cd0564870a360d77d0d7f06c411ce0f85f6d1f60d8003ee27
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating it is a phishing trojan. It contains an embedded URL that, while currently flagged as benign, is part of a pattern often used to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external URIs and the ClamAV detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.1538

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/razvivatel/yapz/~3/AG-UZpNbJGc/square?utm_term=free+motivation+letter+template
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec8ee690a3fc49531a273c/1626115814525/kiboguluwirojonoteroxob.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_off0000c44e.bin
aa3455d5dd98783be89febc3a210a75908150650bd0e908dd5f7d78d3c0a0ce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC44E 10288 bytes
font_01_sfnt_off0000db6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 16792 bytes
font_02_sfnt_off0000f37c.bin
c13240ed1e713cd487d5dfa6acc02657f5f2268d043bdb91cfcaec440aace0a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 16212 bytes

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