Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b37b5867fd63af0…

MALICIOUS

PDF

75.8 KB Created: 2021-07-12 22:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c26590cd2ef01d932b0b8ac2aa4ee81c SHA-1: 1539c164117860d90f29b317ad101cd609a24e54 SHA-256: 6b37b5867fd63af0084c2d7f159698b07a976c0506d221c99df09a38c2783a02
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV heuristic identified this PDF as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing or trojan payload. The presence of embedded URLs, although many are marked benign, suggests an attempt to redirect the user to malicious content. The obfuscated document body and the use of wkhtmltopdf indicate a non-standard PDF generation, often employed to evade detection.

Machine Learning

  • Nyx PDF Classifier clean score 0.1751

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/-MXWpcYQ7kA/square?utm_term=how+much+robux+do+you+need+to+change+your+name
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c6aa684b4e19c9c6505e/1625867946797/mulidosom.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_off0000c856.bin
b6c034c48e3c5e8f69762138f9dfd5a51a5118b38cf3c2ae4cca17867aea2daa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC856 11044 bytes
font_01_sfnt_off0000e1b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 16792 bytes
font_02_sfnt_off0000f9c9.bin
036b3de6fc2b26ad3f2a1932734ab74c746d8a92b364962fb2486ca24ecca568		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 16140 bytes

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