Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4218fa44370934a…

MALICIOUS

PDF

74.4 KB Created: 2021-07-13 17:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59b5e240553494d699bb130fe3d38f3a SHA-1: 940d6a7db7fbe92a6d9515e964b0f74c203dc4c1 SHA-256: a4218fa44370934a2f67b35e56f99507fdc1fb1b63857400ba6acf6fdc4d0ea5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated maliciousness. An external URI pointing to 'crysiq.ru' was extracted, suggesting a phishing lure. The PDF structure also contained duplicate object definitions, a common obfuscation technique in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7746

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://crysiq.ru/square?utm_term=how+much+do+people+get+paid+for+60+days+in
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecae62db07696a6655bf19/1626123874345/dedexoraxuminamumoz.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7ce5581ab8d1aa9de8b0c/1625804373686/bafukuvo.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e9000baa30721e65eda87a/1625882635995/dog_attack_command_in_german.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e82af9b977dd1475cd46a1/1625828089155/harvest_time_in_the_bible.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_off0000c091.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC091 16792 bytes
font_01_sfnt_off0000d8a3.bin
608f33ae6019a29e9dae49d5248ff884972ef7cbd95e42546b518ff94ebbb4fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A3 16148 bytes
font_02_sfnt_off00010288.bin
e704eedfdd1eac0c69a436c442ae85e33fd936c92fdb4e93c873773c20b1634c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10288 11648 bytes

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