Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4b60935a8561d8…

MALICIOUS

PDF

72.8 KB Created: 2021-10-02 13:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee103ebb126a3c62b99aceb796e0c550 SHA-1: d2ba9681c90cc3f769e853efbd4b07d25b056b6c SHA-256: ca4b60935a8561d8c79213a3577a75347e15dfe7d49540618ac6264f1ff39edb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded content indicate it's likely part of a phishing campaign or malware distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • 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://wastran.ru/uplcv?utm_term=how+to+split+screen+black+ops+4
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23254740380.pdf
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/muteposutazofumupopuzodef.pdf
    • http://hoya-system.com/uploads/files/202110011428068673.pdf
    • https://corcreation.twbiz.me/data/fckeditor/files/20210913_040348.pdf
    • http://olympicburger1988.com/uploads/files/jodalobawigumizi.pdf
    • http://teewer.mn/ckfinder/userfiles/files/waditefuluwupajumatejiv.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146e2b6ac778---27930624050.pdf
    • http://maginsaatmetal.com/resimlerfiles/73321504856.pdf
    • https://maconlux.lu/userfiles/files/5383373547.pdf
    • https://suavitinhtannha.net/upload/files/babiniwesivipilotekoj.pdf
    • https://bushregenerators.biz/userfiles/files/bumemipoz.pdf
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/25010481435.pdf
    • http://bridgeonlaw.com/filespath/files/20210927215248.pdf
    • http://tecsun-moscow.ru/docs/file/70282977617.pdf
    • http://gomientrung.vn/uploads/image/files/pusuzubizoka.pdf
    • http://jl-vacuum.com/upload/files/46617145620.pdf
    • http://studiorestagno.eu/userfiles/files/geriberej.pdf
    • http://cuspsurgeons.com/userfiles/file/25884222558.pdf
    • https://mobilaide.com/upload/editor/file/wixedusubuse.pdf
    • http://baldonimarcostudio.eu/userfiles/files/vewevamajubuwedusoduw.pdf
    • http://aktifimmo.lu/userfiles/files/susejazirubakozubuvibuti.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/15755947002.pdf
    • http://mothertheresapublicschool.com/userfiles/file/degigiluje.pdf
    • https://takipcisec.com/calisma2/files/uploads/delanizogaxu.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/d1161a37e6e6fbb921472fe8f81c8392/lozekevuxofidezixumixog.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_off0000b782.bin
cd29e95af3705b92a0441a7f6ed5f09e00ab0a81e7bbdde3d32b3015c5f2789c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB782 17424 bytes
font_01_sfnt_off0000e467.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 16792 bytes
font_02_sfnt_off0000fc7e.bin
dbe1e2ab19b76bf2712a33d49527ff38d92ee164e7f1fc57aefd5742c6ea6f45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7E 10756 bytes

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