Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b000f6471c0aaa…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 04:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3c7b83a11f5e6b62bd1e24bb4218e8e1 SHA-1: 17b04d6a3211e67ec6f03fb9e83b7ebbb4119610 SHA-256: 08b000f6471c0aaa965b0a8b005b9b5649d5952d4610b6c147718ccc88313cba
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable hosting, indicating a link farm designed to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. The presence of embedded JavaScript suggests an attempt to execute code, likely to facilitate the download or redirection to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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 http://stelmart.ru/userfiles/file/19934105028.pdf In PDF document text
    • http://vigen12.com/userfiles/file/93714940957.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/firajegijomimakizuso.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/vawikaxatesuxa.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/fifazewidatod.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/nurixo.pdfIn PDF document text
    • http://freewest.at/muwegodepebotobazikuwot.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/depowinorisefunojezokazo.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/xasikesirutirowutag.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/88628257020.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/99790831024.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613972291bc66---fuluz.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/mekodol.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/74336148878.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/lukovonabazitegulamusipag.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/34399506660.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/91397656781.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/12041074200.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/61259879886.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/vukulejaw.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/94709351109.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/vawajuj.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210906134721.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161321af3322bb---77758721677.pdfIn PDF document text
    • http://gensugroup.com/upload/files/relemekaseluresexarogozif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=onmovies+apk+download+2021PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 10916 bytes
SHA-256: 9c18270cb6648acadff5156aac4dc285299bf217c3443d8d8324e00f0bfa0c42
font_02_sfnt_off00010c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C45 17896 bytes
SHA-256: b9df3568300fb59faab03572fe714ef654ce8b4ec05796b956458c7d7135dcf5

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