Malicious PDF — malware analysis report

Static analysis result for SHA-256 f728b7a3f8ccbb15…

MALICIOUS

PDF

79.3 KB Created: 2021-07-13 19:40:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c492cd4d94fc2433e5fbc17a55fa4b1d SHA-1: 64583d936b9b7b12df454f295a58209d6c74a69e SHA-256: f728b7a3f8ccbb15a1385065064c6309d1f9f07c2e29dd58b9d8669a6f798a2d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains an embedded URI pointing to 'wastran.ru', which is likely part of a phishing or malware distribution scheme. No scripts were extracted, but the presence of an external URI and the ML classification suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8571

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=king+lear+storm+quotes
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec7ae43f7a034ccb79977b/1626110692061/47849369975.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e928b7787dde1a90ae3e73/1625893047871/class_6_science_chapter_2_download.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec8b613f7a034ccb7b6569/1626114913343/tuxugonivuguv.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e79b2f7d3b385c94b223e9/1625791279338/xigetexurapamunojo.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edc1a330d23a7550607dd5/1626194339618/acls_test_questions_and_answers_2020.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec9c07cd1a1204f6ca55ec/1626119175454/pixogusilikawizuroj.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_off0000d5dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 16792 bytes
font_01_sfnt_off0000edee.bin
3adf528f7ffa3415c0167a0e599865d370c76c32cf32c89a6687d3dc8b3c1c77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 16656 bytes
font_02_sfnt_off00011906.bin
06be38c4c46ba423cefcf72dc458bff91e00d7e3f52fb17b4b2f8e23167ce762		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11906 10688 bytes

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