Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbaff977ddc0a569…

MALICIOUS

PDF

82.6 KB Created: 2021-09-24 02:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bf6d734ed523747d0814b6e7f21249c1 SHA-1: 4a01f50a83206eefa194dd953023140808cb9e1c SHA-256: dbaff977ddc0a569bfa77c9d98a744a23604ec962a898dab8909b1155e58c391
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=how+to+watch+judas+and+the+black+messiah+for+free PDF link annotation
    • http://groupelamiri.com/uploads/FCK_files/file/lifuf.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/gogunexifinonalavitemod.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/vewapopirelalav.pdfIn PDF document text
    • http://tiquital.com/documentos/file/5228333616.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/40056599008.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/tuvojefumenilabolexekasig.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/54387669164.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/12803690193.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/xusipuluwaxorivisas.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/26778318862.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/53965431320.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/bapomusajoxudegovavu.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/vekesetavesiva.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/dovawumuzufurobutir.pdfIn PDF document text
    • http://erpos.sk/data/files/5467833735.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/36051198788.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613797d1b0409---40659612691.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/52868715672.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/lepix.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/vebibunupewuw.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631792726.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/61151348070.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/69654021891.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a96fc116a---gavufejigudabajadi.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_off0000d957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 19096 bytes
SHA-256: 414140d8e7918966cd68275c85845420bf4b890dc3b04d15a3b8ad64012e64fb
font_02_sfnt_off00012283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12283 11280 bytes
SHA-256: 7ce199ddfd39ca328f749b4a345a66821f997f38cc4ef9bab0a750c35f4daf7e