Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c2515e45cefdbf…

MALICIOUS

PDF

75.8 KB Created: 2021-02-25 14:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8a759c0ceb7afb525a8d620f3b0c403d SHA-1: e78328c57f3f041053331baf276645a93c1c91fd SHA-256: 67c2515e45cefdbf4781dee67825c6ccc168b938aec48f5e4e153c704a42d3e3
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'jacksth.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to contain search-related text, suggesting a lure to trick users into clicking the malicious link. No scripts were extracted, but the presence of external URIs and the ML detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://jacksth.ru/strik?utm_term=how+much+casio+watch+original PDF link annotation
    • https://cdn.sqhk.co/tapowifilez/jhiXPOV/xutozepirezikuzeze.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/hciheRy/8_ball_pool_hack_2020_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/icVidia/shoot_em_up_bang_bang_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/95DNjfp/puppy_wallpaper_4k_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/dimasemi/Zig7Oid/87511457089.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosira/hMUggkB/zutamufelujofonu.pdfIn PDF document text
    • https://cdn.sqhk.co/xamapetarel/hhcmDhf/78526976234.pdfIn PDF document text
    • http://orbitan.fun/meteor_shower_animal_crossing_september5gvtk.pdfIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/69728987078.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/awadhesh_premi_new_album_song_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/vufunemuwon.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/riniritomuwogupalurapogof.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/66974884242.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/94549741831.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/kudufigunabi/21266269394.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://s3.amazonaws.com/vapelurowar/6In macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 5264 bytes
SHA-256: 3f079e7215edc53383c132e5cf7964698e92ddbeaa3beb7c81277783d384fd30
font_01_sfnt_off0000fdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 10556 bytes
SHA-256: af65351fd55eff5bd92929b9dfb4765bccd04f5b4d8b7922bed2aa9279a836a9

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