Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4f8be7ca7dbb77…

MALICIOUS

PDF

74.5 KB Created: 2021-07-16 15:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b31398faf4a3a22c3dc535a10e661078 SHA-1: 1cad195754bf6a5f1b4f9c2223005b945f946059 SHA-256: 1d4f8be7ca7dbb779e068fc12ea5740af9d14ca55d4d44e5b06c5add79568ea7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated maliciousness. An embedded URI points to the suspicious domain 'infrive.ru', suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of an external URI in a malicious PDF commonly indicates a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7395

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://infrive.ru/square?utm_term=pimento+cheese+fritters
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec84c5b6dedd3ae168e086/1626113221463/one_piece_ebook_free_download.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed06b24918f36a6d5b7489/1626146482619/58867245660.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e785b67ef31d0d76ee00ba/1625785782279/hungry_dragon_mod_apk_unlimited_money.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_off0000c22f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC22F 16792 bytes
font_01_sfnt_off0000da41.bin
9840b6fe991c3c4e0d19e743881264483ea42524e1263791b38f73994104ba34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 16852 bytes
font_02_sfnt_off000105a3.bin
b1183da1e7f3a26a5b6b9eb922cb34745393db06f71859d3463f1f3472820083		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 10396 bytes

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