Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f61c5551ec13322…

MALICIOUS

PDF

82.8 KB Created: 2021-10-10 13:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 43f485df3fb005904e8f22e1905913df SHA-1: 85d50b0f02061d6cf6bbf0dcc9ec0f71f3b671df SHA-256: 6f61c5551ec13322c69050693e6e042f54dff542b3b402ea6cb969697e1df20e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV heuristic strongly indicate maliciousness, with the ML classifier outputting a score of 0.997. The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous external URIs, many of which are hosted on potentially disposable domains, further supports a phishing or link-farming attack pattern. The sample's primary function appears to be the execution of JavaScript to facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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 https://yasacompany.com/upload/files/28882683597.pdf In PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/rujaremajuxekosanalajane.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/niruzive.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/23273783449.pdfIn PDF document text
    • https://gencatakan.com/upload/file/12506800056.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/vivajoxajemiwolamuwezug.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/91215102565.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/72904156196.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/34820468749.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/63148512584.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suritumofeko.pdfIn PDF document text
    • http://toroisg.com/public/images/files/97827539662.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/63002378a4afb7e063077f3c7b7a464f/98378370145.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210929045823345.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/tuvuz.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/65389583588.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/jemefe.pdfIn PDF document text
    • http://enricobarraco.com/files/laxumo.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/73145763399.pdfIn PDF document text
    • http://besteva.com/upload/files/xolof.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/jaxikowasezometilugejutu.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/gevokufudelajomukusewopep.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/94850261836.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5ff2d3bf9---fubug.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161314401c7811---zonunigutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=verbs+past+perfect+listPDF 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_off0000ddc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 10360 bytes
SHA-256: 5e2e016cb6fc8fc14123dd80e425de7ce752f18ee49d5586fd3dac18d064748b
font_02_sfnt_off00010d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2F 18436 bytes
SHA-256: 546abc87504f9587caeac9293fd6c112f51c2b926f2ebda9c5387f159d235ada