Malicious PDF — malware analysis report

Static analysis result for SHA-256 35794ba77a99ce85…

MALICIOUS

PDF

83.0 KB Created: 2021-07-15 21:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 538e8fd4a6ef7b2f3b9a49d6fb92aaa0 SHA-1: 710db5bef48f850aad43c2750fba7e738dafa698 SHA-256: 35794ba77a99ce85cfc12cb6a80c54133ae3631dc07a3f66b6308d4040978efa
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as a phishing trojan. It contains an embedded URL pointing to 'https://archism.ru/square?utm_term=half+day+sick+leave+email', which is likely a phishing lure. 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.

Machine Learning

  • Nyx PDF Classifier clean score 0.1542

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://archism.ru/square?utm_term=half+day+sick+leave+email
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee063f017ec663b540bb58/1626211903498/kenixu.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee71ea2ee8b51fd9386c1e/1626239467147/what_can_you_contribute_to_our_company_sample_answer.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_off0000e535.bin
10d64e85535d519bd6bed8d39bce28b8fad8ca03b01eef2d44298bd11f4cf53f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 10476 bytes
font_01_sfnt_off0000fcfe.bin
61fa9d8d0db2c7aa68632da1ec64be5fa803d2557ff716aa82f45863dd1cb1cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 16252 bytes
font_02_sfnt_off00012720.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12720 16792 bytes

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