Malicious PDF — malware analysis report

Static analysis result for SHA-256 867ea48634af6e8d…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 15:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3d12ee32250caf4bf68570f12920f96 SHA-1: d10dcbf7fc44ee36d19a22404f6cbf6eda610029 SHA-256: 867ea48634af6e8d35d34090511c4c93cd84ca42ad0751fa8048f5c67589baaa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links on disposable domains, likely for phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=android+alternative+store
    • http://orosweb.hu/userfiles/file/53318826557.pdf
    • http://krallarintavugu.com/upload/file/gupawezajoturudajesazirum.pdf
    • https://vcubusinesssolutions.com/userfiles/file/46372787634.pdf
    • http://fundacjahfg.pl/upload/file/tiniwovik.pdf
    • http://originalcheck.it/public/img_admin/file///mamagamobiso.pdf
    • http://etyekilovarda.hu/userfiles/file/xegopo.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/11fc229c9dcd588a7176a2efa354f726/27812740056.pdf
    • http://auto4-spb.ru/public/images/ckfinder/files/96268380440.pdf
    • https://turbooto.vn/upload/files/sobadesajovaroxizevi.pdf
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/bizemiwuge.pdf
    • http://rkmaster.ru/uploads/files/7246176732.pdf
    • http://metafelix.it/userfiles/files/77538030856.pdf
    • http://architectureanddesign.it/userfiles/files/dorisikokugabozuxosipud.pdf
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/74688293340.pdf
    • http://bayanairag.com/uploads/userfiles/files/89608669354.pdf
    • http://kapalishakti.com/ckfinder/userfiles/files/96560413858.pdf
    • http://astprom.ru/sites/default/files/file/67268482319.pdf
    • http://www.colormotion.cz/UserFiles/file/rutanerexu.pdf
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/47654389865.pdf
    • http://elvirajogsi.hu/ckfinder/userfiles/files/56012026436.pdf
    • http://aa-nusd.jp/3431883132.pdf
    • http://on-video.com/movies/movie_data/file/75813100481.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8730b2cdb---xujavipozetuvukenude.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f3.bin
fdfef5051d44be78487eb8c05d510addcbad30183dd56faa0d4c47b832ac3370		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 18260 bytes
font_01_sfnt_off000115d6.bin
25965604a6ffb4545e5cacdc76439ee6db13bcc0102baf9a8debd294ebe081df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 10288 bytes
font_02_sfnt_off00012d20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D20 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.