Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0821bee784bf54…

MALICIOUS

PDF

68.9 KB Created: 2021-07-14 00:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9502631fc66359ce8329e694a551a88c SHA-1: 94a6435abccfb15787fa964f748d5c145c37ca6b SHA-256: 4d0821bee784bf54648c67193fc779be39298aca38b4dbedcffbe775de6dbc4b
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating phishing and trojan activity. It contains an embedded URI that points to a URL which, while currently marked as benign, is suspicious in context. The PDF structure also shows duplicate object bodies, a common obfuscation technique. The primary attack vector appears to be directing the user to an external resource via the embedded link.

Machine Learning

  • Nyx PDF Classifier clean score 0.1690

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://feedproxy.google.com/~r/razvivatel/yapz/~3/gOBB6uaVNRA/square?utm_term=geometry+eoc+review+packet+answers
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec87c9f89f8e700bf7dd1a/1626113993625/luteinizing_hormone_high_in_females.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_off0000ad23.bin
a4386cbe8f9f82d5897d2ed56b751f8fb3287cd693232c9f9997d1105ed8fdf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD23 10888 bytes
font_01_sfnt_off0000c674.bin
8701ac754aab037433a4f4350d198c6b67c3c8f8605dbb9af7717a320a5ef232		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC674 15612 bytes
font_02_sfnt_off0000ee4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 16792 bytes

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