Malicious PDF — malware analysis report

Static analysis result for SHA-256 772f05256124bf46…

MALICIOUS

PDF

73.7 KB Created: 2021-09-16 17:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b33dfbde942c11557db9d1c5a03d058 SHA-1: 5f4a1110fa6ccfb6bbed80f49d18f516652318fe SHA-256: 772f05256124bf46654b7660e231d67bbad3bf9b7c4501320c1c00005b23b4e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://milkexim.ru/imgeditor/file/36864081448.pdf
    • http://lso-msm.com/userfiles/file/labawisalumok.pdf
    • http://bioident.pl/photos_fck/file/81356394803.pdf
    • http://meuble-tunisie.com/userfiles/file/40217730472.pdf
    • http://kleinschaden.expert/userfiles/file/vimawevikiliwoluzivupovit.pdf
    • http://palakkadtourism.in/ckfinder/userfiles/files/24264628467.pdf
    • http://xlpe.net/Images_upload/files/21191776251.pdf
    • http://zanethompson.com/userfiles/file/17989184771.pdf
    • http://hublihorse.com/uploads/userfiles/files/zixefafokeg.pdf
    • https://creteservices.com/FCKeditor/userimages/file/17478193576.pdf
    • http://velapower.com/glwh/UploadFile/file/2021090617230373499.pdf
    • http://tonyprins.nl/images/uploads/file/85345264740.pdf
    • http://saconsultancy.com/userfiles/file/xefope.pdf
    • http://yourhandmadeitems.com/userfiles/file/43543709391.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/r6i3sa30cfns2e10ugurhfvnve/tigewikopagusekomifefuw.pdf
    • http://www.ecvbrass.ch/user/web/file/zijoduxija.pdf
    • http://rtm-plus.com/ckfinder/userfiles/files/91310177424.pdf
    • http://honda-vo.com/upload/file/petaninumefetelubenuzi.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613f06c60f951---96955321749.pdf
    • http://omatsuri.kr/data/userfiles/files/67594507481.pdf
    • http://biosite.ru/images/news/file/jimekukixi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=stick+war+legacy+mod+apk+2021
    • 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_off0000bb8a.bin
75b522dc2e8595254217b3cdadd9dae970f24f018c0b2909a708f8c8e70358e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8A 16832 bytes
font_01_sfnt_off0000e729.bin
8b6f676c2c418ad42cbec3a1d96db8ba43ea65e2c3f79663a0fc637e2b5d283e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 11244 bytes
font_02_sfnt_off00010182.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10182 16792 bytes

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