Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d72aceeee4a8b7…

MALICIOUS

PDF

81.0 KB Created: 2021-07-14 00:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bbcd6147c0b9c298ac459bfb7c61960 SHA-1: e0f137ca03ecb5e3096308143cfc681dd239f1d5 SHA-256: 88d72aceeee4a8b77f2066969fda7a39ec2d3699df34353890ac653373c00e3c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature Pdf.Phishing.Trojan. The embedded URL, https://inwebjor.ru/square?utm_term=conditional+sentence+type+1+and+2, is the primary indicator of malicious intent, likely leading to a phishing or malware distribution site. Although no scripts were explicitly extracted, the PDF structure and the presence of an external URI suggest an attempt to redirect the user, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier clean score 0.1467

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://inwebjor.ru/square?utm_term=conditional+sentence+type+1+and+2
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7c50ed93aeb546a134b08/1625801998141/fanaa_movie_audio_songs_download.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8e7fbcf8be39b50610ca/1626115712036/bissell_cleaner_manual.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_off0000d8a1.bin
65c5abf033a9e043202ab4e4b01822e486553967ccfbd24bdf47440eaf60fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A1 18428 bytes
font_01_sfnt_off000107a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107A6 16792 bytes
font_02_sfnt_off00011fbd.bin
6b369a62825069dc7d10f9d3627d8c9ef7d7ff693a0d6dccce3d8f5bf2d0a564		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBD 10724 bytes

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