Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e2fa13f6469621…

MALICIOUS

PDF

76.1 KB Created: 2021-07-13 03:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ecccbc92a3706ba2c67d86ac6315f35 SHA-1: fae3de6337d52953c624b80c83725c7833bf7111 SHA-256: d5e2fa13f64696217bb549d10fbfbf08a9b6c7e912e03080d42e96961fcd4cbb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a critical detection score. It contains an embedded URI pointing to 'pistant.ru', which is likely a phishing or malware distribution domain. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7483

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=how+to+make+a+copy+of+a+pdf+file
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ecb2d8d59ba7421a419287/1626125016422/mozart_beethoven_bach_chopin_tchaikovsky_handel.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec8d65bcf8be39b505f86e/1626115429546/78697337386.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ecc6d06d9796105184ef3f/1626130128274/45806914857.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e78cda8592fe3a588cfe31/1625787610634/does_a_cosigner_have_to_be_present_when_buying_a_car.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_off0000ce7c.bin
566096ea59aceb7e36a059c9f46e06ed3e9c89cf8ba7bc93c3efe3120aa54ebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7C 14924 bytes
font_01_sfnt_off0000f42f.bin
e14e5b5cdda1f7e6f23b3aa9481bf6e48b5f71e73c096c7a6de5f8874c819127		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 10692 bytes
font_02_sfnt_off00010cc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 16792 bytes

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