Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b1a37146efa672…

MALICIOUS

PDF

84.8 KB Created: 2021-09-15 09:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 299a130103fd56216242c39ab8e55f9b SHA-1: 22d3a5986e5d6eb270264966e1a475c58c5851af SHA-256: d8b1a37146efa672850535aec02358706d0a3d232bd056ead4ea44d70a026cdb
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many pointing to disposable domains, which is characteristic of a link farm or SEO poisoning attack. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the sheer volume of suspicious URLs suggests an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 4

  • 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://hitelesen.com/userfiles/file/kufumisiwewu.pdf In PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/tizuxonafixezogiw.pdfIn PDF document text
    • http://info56.ru/userfiles/file/68243382641.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/95839575192.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/33576134194.pdfIn PDF document text
    • http://022-web.cn/uploadfile/file/20210914192245391.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415538c0bf0---guxutowaxokemumedibe.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/tufagebarudatavarababiwa.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/90742451317.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/5271332536.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/fenitatuvaxakizerizula.pdfIn PDF document text
    • https://andana.us/files/files/98959359118.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/804492182.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/nulonuxanakopirobokej.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/ruxija.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/51675850552.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/tekulive.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/fagekipin.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/nuwetixakawoxevimipes.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/37190918421.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/66480332148.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/91743456126.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/romemajoripigevuzusemefo.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/irte1alcthpkc0qokpdg7t2862/77045220444.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/gomogefu.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/botubugefati.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/tenadimibudazubara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=battle+axe+fortnite+aimbotPDF 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_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 10500 bytes
SHA-256: a85cb8af019c154b06c5c8300935c12e1ace5bc25769bc0216bcab9521a240bf
font_02_sfnt_off00011619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11619 18104 bytes
SHA-256: dcdb554007854b9b99c1c9f2d111b7fc31c74fddca3f1720d478823abc203ed8