Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d16999ed12ab08e…

MALICIOUS

PDF

74.3 KB Created: 2021-09-13 15:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 56da7cdfb320a181a3aa7f5afe946f97 SHA-1: a632eb0e6d10f3e8af4c2298b741c8ddecff62ed SHA-256: 4d16999ed12ab08e723f5731c2dae4b8858d87214b4e596c28a078e8c545abef
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The embedded JavaScript may be used to further obfuscate the malicious activity or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://crewmak.ru/uplcv?utm_term=lego+jurassic+world+mod+apk PDF link annotation
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/78152631842.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/49875311643.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/famokozilulomu.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/43465391002.pdfIn PDF document text
    • http://www.77ice.com/upload/files/paborasuvun.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/gowiwinatanonotixevifon.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/pigonejavusutovil.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/68590330589.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/9929899789.pdfIn PDF document text
    • http://fluorescent-training.com/file/burubuzimujigip.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/98311939801.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/tanowoveneso.pdfIn PDF document text
    • http://kesifveotesi.com/files/vaxefirojefud.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/32619589496.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/muwozumorij.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/22390504160.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/57581385140.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/a2u5mghggutnkaf7k1ept0tejb/lavezujezotunaparosuwa.pdfIn PDF document text
    • http://talesma.com/E/file/kodenenaviwikipuva.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/nuwosuzukep.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa599395c---ravaposonu.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/10825636290.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/12057379253.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/jorinugovepupejev.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_off0000be79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD690 11020 bytes
SHA-256: 15c1de15e71d32e975bd528ffefe354a49953f89d29461f352209ea76e92edf5
font_02_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 17044 bytes
SHA-256: bb6bfa6cc201f25982fa2a6559680b5fc6db2440a0488ca54a2043870923d182