Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3d6d94587f2050…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 10:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 937bdc1c9254b245340f4c76ed613a29 SHA-1: 626a24dee5388d23bd77735fce3ae83d00df9033 SHA-256: 8c3d6d94587f2050ae2c7cb449d0ec6d9973710d3ccdf477c47d729abb1aba46
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these deceptive links, likely to download further malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fsbulletsandbrass.com/userfiles/files/9830264797.pdf
    • http://titibbs.xyz/js/ckfinder/userfiles/files/13376896949.pdf
    • http://snft.ro/media/file/kawilirubol.pdf
    • http://opuspointpartners.com/ckfinder/userfiles/files/88141138296.pdf
    • http://koreadramatour.com/FileData/ckfinder/files/20210908_61B4A2A5F1A67401.pdf
    • http://amunt.madteam.net/ckfinder/userfiles/files/dimexu.pdf
    • https://dolaodong.com/userfiles/file/71431016696.pdf
    • http://yameitecl.com/ckfinder/userfiles/files/20210903_040037.pdf
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/10943452026.pdf
    • https://cleartunemonitors.com/ckfinder/userfiles/files/66447956696.pdf
    • http://waxiangyuan.com/upload_fck/file/2021-9-2/20210902173035552341.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/2b8349a0ec79a0ebee032ac988ed4fca/vodinawexegejevezere.pdf
    • http://rlangkhan.com/upload/userfiles/files/10569658219.pdf
    • http://shceping.com/upFile/photos/2021-9/file/tilavaxetabironelezafeme.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613812af69803---39411335245.pdf
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/bijufif.pdf
    • http://modnyi-buket.ru/uploads/files/25449229667.pdf
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/14079915004.pdf
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/fabizonitux.pdf
    • http://bnblspecialities.com/userfiles/files/lasazuwowukewifabifak.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=suicide+squad+streaming+service
    • 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_off0000d90f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 16792 bytes
font_01_sfnt_off0000f121.bin
bf27b734b30a119625e422430e8632efa101b45d9857b511d8f39087d50a7cc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 18596 bytes
font_02_sfnt_off00012160.bin
e90970d9e391bc71c92b5dc0186800920caa0aaf8c85613ed23061fd72cd8bb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12160 10932 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.