Malicious PDF — malware analysis report

Static analysis result for SHA-256 40aedb3e5413a360…

MALICIOUS

PDF

81.3 KB Created: 2021-07-21 01:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 284ae9c3e4b8dfc55a5f95aaa021adcf SHA-1: 56385f3c6a3aac39496001792689d8cedb3fff6b SHA-256: 40aedb3e5413a360813e628d5459941f0ed84f3e8c8d1d83012d11db2688fd94
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV heuristic identified this PDF as 'Pdf.Phishing.Trojan', indicating a malicious intent. The presence of embedded URLs, although marked as benign in this analysis, suggests an attempt to redirect the user. The PDF structure itself contains duplicate objects, which can sometimes be used to obfuscate malicious content. Given the phishing detection and the nature of PDF files, it is likely used as a spearphishing attachment to lure victims.

Machine Learning

  • Nyx PDF Classifier clean score 0.1467

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=maths+interview+questions+and+answers+for+teachers
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f2fce3668793736d2cbdf3/1626537188045/tofubasu.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f14ff2fe1af12ac2c515e2/1626427378690/forward_freight_agreement.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_off0000dd76.bin
bffc91a14fa83e41dd5601e0a1b28ca878c0ff12a596b06116fb9d48b1b9f46b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 10916 bytes
font_01_sfnt_off0000f697.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 16792 bytes
font_02_sfnt_off00010ea9.bin
2737fb732bb76ab5004d99143afd2a5deeb27a80f2ee108ce82567a6e0d8ca2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA9 16496 bytes

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