Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f0542f58c1d1eb…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 14:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4108b2dabd2f7bd2229efc9c79f68e1 SHA-1: 5abae196b254ce52a9236366eee217f0278206e5 SHA-256: 92f0542f58c1d1ebedc82a644711ff8232f333a8a3a98fbade179be4c7f76672
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://chcial.ru/uplcv?utm_term=carx+drift+racing+online+money+cheat PDF link annotation
    • https://booknowrentalimo.ch/userfiles/files/84119605563.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/suvuxibikaguvabete.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/jegibezagug.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/78486158201.pdfIn PDF document text
    • http://kodemari.info/data/files/wadimefatadipexuvenav.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/60805114814.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/39684504547.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/eh2e6r0sa22pusvoij9o2qem7l/takutenasakum.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/lavumasu.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/44531198136.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/suboxu.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/49674737889.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/11790208946.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/51276350266.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/50237772973.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/farajuwe.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/1043150817614d1734dcf45.pdfIn PDF document text
    • http://midospa.com/upload/files/36151144840.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/wakaxajejakus.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2df49f854---38538461837.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202197335284190.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/votibuxumoxamigazolax.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/nepilalamobidukoliwokinus.pdfIn PDF document text
    • 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_off0000ae14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE14 11000 bytes
SHA-256: 22874948746900fc462c2b13c710a9dd854fdd5499342aa3d6ea04241598d1a1
font_01_sfnt_off0000c744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC744 15748 bytes
SHA-256: 62c4af60d1239c1bd4e04379bc7245af004a36db81c32cbf5a8e5e28a4907783
font_02_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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