Malicious PDF — malware analysis report

Static analysis result for SHA-256 7496a09dabdd7be5…

MALICIOUS

PDF

77.7 KB Created: 2021-07-12 21:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4339ac7769279931837f7a2778e3e29f SHA-1: 613c76b8687a338690f724552311252af563f5c9 SHA-256: 7496a09dabdd7be5a037b9b5f6a85d3253a33acb4db94cd2fce2029e76191afe
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as a phishing trojan by ClamAV. It contains an embedded URL pointing to 'wastran.ru', which is likely part of a phishing campaign. Although no scripts were explicitly extracted, the PDF structure and the presence of an external URI suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.2227

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://wastran.ru/square?utm_term=three+steps+of+the+calvin+cycle
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec819abdd82073f6fede3e/1626112410267/august_act_date.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8d4745ef51a130ea0d53a/1625871477088/gapuvadetekutunuzilejatig.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_off0000d023.bin
04e9eadd29e48dc29ef50f9b8e3b0de2883508ac9a26ac63d30a8d00b32cf852		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD023 10720 bytes
font_01_sfnt_off0000e8c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 16792 bytes
font_02_sfnt_off000100d8.bin
e4d6b0e28fe1b551dad8e36401b5b23ea93aa58f8dd770dddf1a950920752816		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 16368 bytes

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