Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6ce94f6695b558…

MALICIOUS

PDF

70.8 KB Created: 2021-09-16 16:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8079ac302c93e171d7e416b7decebbd4 SHA-1: ffcaa55a0b28f02da8799de5f255460869dbb14e SHA-256: 7f6ce94f6695b558189c98d71925a65be9b5b40fcdc14260b3295ddae44374de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable domains or redirectors, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While 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 0.9965

Heuristics 5

  • 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.
  • 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://medvor.ru/uplcv?utm_term=this+naked+mind+pdf PDF link annotation
    • http://rioairporttransfer.com/ckfinder/userfiles/files/95591950872.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aff759122c---28287248167.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/4955719185.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/42177530771.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/zuvoxixu.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/galubot.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/65903423497.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/72104171466.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/sijonanezakudibimekodud.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/furegenuwapusupixabiraxi.pdfIn PDF document text
    • http://lagrupacio.cat/file/godetotibemo.pdfIn PDF document text
    • http://metapolar.hu/tmp/52365050696.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/gateli.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/13842bf7c8a711451f38f81f6ad05fc2/48907168247.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/gurolobubokobugisamuke.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/jesuzorivagefapawuj.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/61756800819.pdfIn PDF document text
    • http://devison-matras.com/upload/file/dinokifulov.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/vizowuti.pdfIn PDF document text
    • http://taxfreepoint.com/file/kovuvoboxujidul.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/56495357018.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/70708856910.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_off0000b401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB401 16468 bytes
SHA-256: 863cb39e5ffd18e2671b5c31fe75506c4a17dd77175011d911c20e90f61bb3d5
font_01_sfnt_off0000de61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 10456 bytes
SHA-256: b964e3d8f63e9fc7b3c07e9d11837d5841d2b2ac54b394a896a1c8c0b19cd781

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