Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4489b3e522dd55e…

MALICIOUS

PDF

73.6 KB Created: 2021-07-14 02:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12b110b3b6fa0b61b383c84ebab7a9ce SHA-1: 97ffd271e2a6d22b00a0cfeb2121a5744caef1b5 SHA-256: b4489b3e522dd55e48994fc882cf5f7f496910daa90275e600938ee4b452d75f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV with a signature indicating it is a phishing trojan. An external URI heuristic identified a URL pointing to 'nomylo.ru', which is likely a phishing site. The PDF was generated by wkhtmltopdf, a tool sometimes used to create malicious documents.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2686

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/square?utm_term=alexander+the+great+quotes+pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edb718fe64123bb485e98b/1626191640198/town_of_north_andover_ma.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e788ea4b964f05b843318c/1625786602502/hacked_carrom_disc_pool_apk.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_off0000bf4f.bin
7e22dad693dfb7096528cc9a4aa92347cc99af1ee9dc12494c6e277eb47ae829		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4F 16380 bytes
font_01_sfnt_off0000e997.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 16792 bytes
font_02_sfnt_off000101ae.bin
e5afb1e138ae7865a3ccd19e7ae104a2eb29477cfa9146f1700c7ebb88190539		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101AE 11012 bytes

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