Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7cde2793202cff…

MALICIOUS

PDF

92.2 KB Created: 2021-10-08 09:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f0531d7c4ed0311dc997f7aaa596f59 SHA-1: 72ca2bd232b55e7666175fd9b16448b8b2e03953 SHA-256: 0f7cde2793202cff79775be8d57d221ba895f5d6db12e3d9aa147d8e55138f5e
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous disposable URLs, indicating an attempt to trick users into downloading further malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and URL patterns suggest a downloader or redirector role.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1615bd2d33743a---25735464910.pdf In PDF document text
    • https://epiphanych.com/images/file/busipiker.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/2225389987.pdfIn PDF document text
    • https://nhatthiengroup.com/files/uploaded/files/92473700923.pdfIn PDF document text
    • http://tatooazh.ru/files/files/raxejuzanezizumedikabu.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/91217801966.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/39333724415.pdfIn PDF document text
    • http://agilesolutions.in/uploads/lenaxinexosaligura.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/gemawagenomazokajutos.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/sekaxuvoz.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/rirawifodojotif.pdfIn PDF document text
    • https://niceppl.com/images/file/65439815934.pdfIn PDF document text
    • http://besteva.com/upload/files/dufegobuzumedo.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/6665305362.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/wajojikogazutufuriler.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/putiziluki.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/fagawuzikul.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/80722058149.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/rumejemi.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/37362561466.pdfIn PDF document text
    • https://geniodelweb.com/file/67246043485.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/36625118783.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c43cbfb68bbcdb16af500666a20c9b79/nefobowaxuvazefivugiwim.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/nasararaxenupa.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c169cb49b1---nuzobelabuzinevexizuvisox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+find+your+apartment+in+gta+5PDF link annotation
    • 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 18752 bytes
SHA-256: a7ff4a7e8b7d1182ed09e1d17513061b60178d6e356f9ea1e40ee9d2934b2d34
font_01_sfnt_off000115a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBC 11052 bytes
SHA-256: a318781bae3de8ab5f7c922a80f5cf5416c40038cb43ebcbf56d54cf84812d09
font_03_sfnt_off00014749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14749 18064 bytes
SHA-256: 39122796a0f1469d569c1d234a8f6ad34dbfb1c93721e9acfcd51e002b836c17