Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ed7349990e8e0c…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 09:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6a569f3df07f9907da8f7aeb002ca2e SHA-1: 493b2170ee0892c0d80a1cb869603014dc8f5e21 SHA-256: e5ed7349990e8e0c32dc71420f6a15800dd368c3c08e87ef11b3828bd0fdf091
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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=example+of+chapter+2+in+quantitative+research PDF link annotation
    • http://tutaylamhet.com/storage/ckfinder/files/87059560316.pdfIn PDF document text
    • https://stotex.rs/files/40291858247.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/59313873416.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/47651224008.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/zaximuxusuzifexejakub.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/nawobetefajafuwo.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/bebufimigedekijunizabu.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/4facca3dde48c39adea5343ebf94f244/wakofurizovatelud.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/xajazekufuxejenimo.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/zowuverixikesuzevolafad.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/gasifagunilexuxi.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/mefenefadusifakesixep.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/25871266651.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/65101715081.pdfIn PDF document text
    • https://e-midas.ro/files/file/mudapituluvumewefelureju.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/wilimowexikunabesax.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161342486b6919---tajomapon.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/97642815751.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/2336207393.pdfIn PDF document text
    • http://slsnn.ru/content/files/63268547367.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/kisejatukuwuxafud.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210910081145.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/vatirabij.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/futoredimolofutejubiv.pdfIn PDF document text
    • http://kezmosas.hu/files/file/82892276748.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_off0000b402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB402 11264 bytes
SHA-256: 7e0a7f9625996b5632ce01a2bd9e35d1c48c51068987ddec0ac98136457b83a7
font_01_sfnt_off0000ce54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 14848 bytes
SHA-256: a81ea5cad379d1507d35ed9cd102887fb9504bface5241a90c9e89f3ad63811d