Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af51ff94e5dbfe9…

MALICIOUS

PDF

81.2 KB Created: 2021-07-15 09:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4e55c79382c22a37cd97b74797ad378 SHA-1: d9fa42cebcb6a961bfb485f29e9e8686d25a2d72 SHA-256: 8af51ff94e5dbfe9b88063786e4dcbfd737605cf6d7128b9097f9f71efafbb1f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'pistant.ru', which is likely a phishing or malware distribution site. The PDF's structure and the presence of an external URI suggest it's designed to trick users into visiting a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9031

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://pistant.ru/square?utm_term=gta+5+map+franklin%27s+aunt%27s+house
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7a61797884458c99ea853/1625794071899/wupaxurenulomijolubozimi.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e9075c566ded7d61abc42b/1625884508263/buvoxotejokadafadezono.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e92bf58fb24157da707c80/1625893878062/phosphorus_oxide_ionic_or_covalent.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efd08ae00eb31d7cebe9a0/1626329226774/types_of_statistical_tests.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee5c12537273346e31c3ce/1626233874716/74941866.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8d00f4b4775d049fdca4/1626115328444/the_most_dangerous_game_character_traits.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e95d763b7e7c633451ffea/1625906550558/content_being_single.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_off0000d443.bin
4fb098d051ffb1c8a04a7a59d2c8bab1a64e34cb877d64f0391e4c6ac150d23c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD443 19952 bytes
font_01_sfnt_off0001071f.bin
b15f0c0801fd45c4d2f91d43857e6e4fec8a484d1c071b129ae33c48ddba0535		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 11024 bytes
font_02_sfnt_off000120a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120A8 16792 bytes

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