Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1236b4c89e38924…

MALICIOUS

PDF

69.9 KB Created: 2021-09-18 04:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ad9f40410f740a25e74e208c4504c7a SHA-1: 9f224d0b78a0858b1c33f6aec19d3005a5087918 SHA-256: f1236b4c89e389242dc1145dc7f95977005cdfdc2c01f3424be62a37322b36bc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://focalthai.com/file_media/file_image/file/15959745777.pdf In PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/noxuxojiwujetunawero.pdfIn PDF document text
    • http://didula.ru/img/file/29457497892.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/53692463341.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/34787180603.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/woxuzavitexolebolaji.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/zelofofewowusajonafoleral.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/98758288933.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/tekobinoxatalosip.pdfIn PDF document text
    • http://elektron.be/public/userimgs/files/71380900763.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/40096952673.pdfIn PDF document text
    • https://webmenuplus.com/images/file/nijetagixetamufedubabu.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/a54dfe9525894a2a7f1670204ba51b28/70064756195.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/gareluwibe.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136653839813---3647990251.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/danepulironatuwarotaje.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/11086650858.pdfIn PDF document text
    • http://katela.net/userData/board/file/foboku.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/23773383899.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/78377215149.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/fexovov.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/75967587114.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/rabivafololavopu.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/66811228956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=final+fantasy+sonicPDF 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_off0000b610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB610 10188 bytes
SHA-256: 379ee96ba92aea5cdb4f90d118d7a830316e0d998de67a07434bba4b219f839c
font_01_sfnt_off0000cd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE519 14888 bytes
SHA-256: f3edbfd7d6648dd7e152e41a4bea37de1ec26a210c1bc73cfe65828192614ae9