Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ebfd2e7379507b3…

MALICIOUS

PDF

77.2 KB Created: 2021-07-12 23:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae1e5fd94422789193f169fba7afd9cb SHA-1: 240e6dc2aee2bba73019cc053b9267b3e1a9d157 SHA-256: 6ebfd2e7379507b315d97560f7df521e693f878623af864cac8666055fe61a8a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with a high ML classifier score and a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains an embedded URI pointing to a suspicious domain, 'chcial.ru', which is likely used to host a phishing page or a second-stage payload. No scripts were extracted, but the PDF structure and embedded URI strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7390

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=rule+of+divisibility+by+2
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec714a2de9850677716f09/1626108234389/molecular_structure_of_the_cell_membrane.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8b56727f6503cc830b8e7/1625863528131/we_used_to_laugh_we_used_to_cry.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec92f78c19ad4998dc3daa/1626116856042/35331482816.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7e23181ab8d1aa9df4c8c/1625809457476/fifa_18_ppsspp_zip_file_download.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_off0000cd47.bin
8cf344ffb1b90ba82145830833566cbd081d6a92a19175495a5b979804aeedaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD47 10568 bytes
font_01_sfnt_off0000e598.bin
7801515e63795bc84e6c8851c0932d4a2437cb20408bea7a86e0e388185dda80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 16616 bytes
font_02_sfnt_off000110f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110F4 16792 bytes

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