Malicious PDF — malware analysis report

Static analysis result for SHA-256 3596fd8e9e15f54b…

MALICIOUS

PDF

103.4 KB Created: 2021-09-08 19:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dc00842bfac9984d3d629dff52002850 SHA-1: 6cf7af337e3c01b093cf9356e3898324ba875f06 SHA-256: 3596fd8e9e15f54b8b30757c61db844bb4621e41ae179f8e730f9c48d3880199
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 5

  • 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.
  • 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://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3b7b3f05---senimejurazabored.pdf In PDF document text
    • http://senseoftourism.dk/userfiles/file/famodiwo.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/zidejitokuxigizudel.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/filizowis.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/veridadoxajanuloni.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/vilevesofokomiza.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/56606771557.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/sinajajiwewamejexewazomib.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/26545250789.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/88598152049.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/81474651481.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/delifopufasus.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/kijokasigapalubokipev.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/73105632566.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/sunolidubodib.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/j9muj2j07jh8prd14blued15hc/sesaparawokobowal.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/52031969841.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/78735128625.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/34250707668.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/36638982354.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/zifufe.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/sokebobafujaxepe.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/44089117957.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/90163714936.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/84943426273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=birthday+invitation+format+pdfPDF 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_off000110d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D5 18276 bytes
SHA-256: af6ed9f92d2ab4677879c79ef61c96b69526cdc03aeaf29f508b35e49a234a46
font_01_sfnt_off00012dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D4 19164 bytes
SHA-256: 99db0d179e0c760829edfd7e15cfa79b16f30ff3211d4170a3945017974c7ed3
font_03_sfnt_off000176ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176ED 10652 bytes
SHA-256: 2f90761d0e82d743df90f5e4b9e549839fdd0b6a5cc1a90fca2320ab53975b95