Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d87dce6eb72173…

MALICIOUS

PDF

71.8 KB Created: 2021-07-15 20:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: de8258c521649765d3b81bb0d6ba1b86 SHA-1: 6b1851d5f4c7edb35f0ca47e1508cc09d8453a9b SHA-256: c8d87dce6eb72173e4dbaba308cfdd4727cda70f6cb5c32069bb9e3f24a406b7
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV heuristic identified this PDF as Pdf.Phishing.Trojan, and an external URI pointing to 'chcial.ru' was extracted. While no scripts were directly observed, the PDF structure and the presence of an external URL suggest an attempt to redirect the user to a malicious site, likely for phishing purposes. The authoring application 'wkhtmltopdf' is noted but does not directly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.1902

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://chcial.ru/square?utm_term=when+should+you+go+to+the+hospital+after+your+water+breaks PDF link annotation
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60efd199fdf1560143489a8b/1626329497884/mobile_car_wash_and_valet_near_me.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC6 16328 bytes
SHA-256: 81d9b1ab1902276d3c22359c75bbd86f5ac9a46f7fc1a6c8d5ded53a92b95148
font_02_sfnt_off0000f8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DB 11304 bytes
SHA-256: fc2f92987997b9962ff1277c23c247956005c15e4c2ad4abcfc851a0d09ac90c

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