Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d005caa985f9bf…

MALICIOUS

PDF

77.2 KB Created: 2021-07-14 06:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d15be7db62be475331c1a865c15c1258 SHA-1: 96798016258f4b216d431d6f62262dbc875e574a SHA-256: a6d005caa985f9bf9541af78cffe07fb0a1c5ad8a7f76964f037069e38b5247e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'smidgel.ru', which is likely the malicious destination. The document body is heavily obfuscated and truncated, preventing a detailed analysis of its specific lure, but the presence of the external URI and the malware detection strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7604

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://smidgel.ru/square?utm_term=how+to+make+a+private+tf2+server
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec8da305183b3b579e0099/1626115491224/delsey_luggage_lock_instructions.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee5380f6c772366d2f871e/1626231680912/53128362392.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e854d5671fa8664f6e6b7b/1625838805961/vawepikidilixokusu.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_off0000c987.bin
e61857a1a6c3913eef60d4c81375600d0424c877e22122d49e050298422cfeae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC987 10724 bytes
font_01_sfnt_off0000e249.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 16792 bytes
font_02_sfnt_off0000fa5b.bin
18066da6fb5091585923b0b0f055386b769a66c05c5471d5e941652c301ccd87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 17832 bytes

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