Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9a79ae803d4a81…

MALICIOUS

PDF

70.4 KB Created: 2021-10-03 12:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e10d860ee4fa7792df702f44e52bf065 SHA-1: b36729e942dabcdf5fb4d1be54e03859d3be15a4 SHA-256: 7a9a79ae803d4a81c0dbf0b1660ab1815901ef58693ece165e274e3f19439f2b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the document acting as a link farm on disposable hosting, further supporting a phishing or malware distribution attack pattern. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=global+stock+market+worth PDF link annotation
    • http://ozdoby-betonowe21.pl/Upload/file/vaderuvurukaxureluwul.pdfIn PDF document text
    • https://webmanagement.jbclub.ro/images/file/89839879823.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/miwawesofe.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/kagugikezonalexebozu.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///pesinon.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/tomarure.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/edgoehflnj2d6tnfgdflmkuid5/febepavijemelux.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/85038642148.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/55790817478.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/82021865467.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/laligitimojikoluke.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/87362560552.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fa1e731ce---65800785644.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/pivibuwozebifigunuxudila.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/nedijoritupap.pdfIn PDF document text
    • https://naves.cz/res/file/pozosonofarus.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/xusonulojuvedujilato.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/paluririxanefawove.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/15834767352.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/ferir.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/repapatipanatazivon.pdfIn PDF document text
    • http://bamor.org/userfiles/file/puvif.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/wopopizefemurebimoz.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/73770668983.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/52274541308.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_off0000b093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB093 10656 bytes
SHA-256: 997f5f249276d97c02e0a10f3b13596bddd6d8046e3903a71271d6e166c5646c
font_01_sfnt_off0000c926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 16732 bytes
SHA-256: 0a12f381b217463b2cd7241667025ae6665cb63fe398d11c267fe8f2fe633bb1