Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f68a52d2c20e519…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 15:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 23ecbd02fbf15802b8dbaff21dfa0cd1 SHA-1: c48bd7bc141c3953fe21c5fab3965c3c5fb590dc SHA-256: 8f68a52d2c20e519e833026836d577a790a87552201302aa0fb95de5d712f857
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The presence of numerous external URIs, many pointing to PDF files on various domains, suggests a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern as a link farm on disposable hosting, often used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/63909551371.pdf In PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/pebaruwibuzaseve.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/47696900822.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/sevavepomosefolavosi.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/25051576676.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/voriwemepafa.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/bukenexufodirobaparug.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16130e1678b41c---kagoxozimovusop.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/21377243157.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/xupigemevubi.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/25141186945.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/ruverivak.pdfIn PDF document text
    • https://gencatakan.com/upload/file/morawudigivoke.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/tukepek.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/vatemasejar.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/sepopepixubekobatavitawo.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/90433697262.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/74938449179.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/91d0712975dfc27169a8bd0a6fcd4d76/wovaf.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/66647758344.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/matavupipokajelevitur.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/95791604476.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/kafixa.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/74480396339.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/99211545948.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/vonivorifivi.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/6844209812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bus+simulator+3d+game+downloadPDF link annotation
    • 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_off0000e5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A9 17328 bytes
SHA-256: 0afc873c935d8580675e89fa0388ee5162ec10a3ffcf8d7002ae352940771b52
font_01_sfnt_off00011298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAF 11004 bytes
SHA-256: 4ddf35ddbc0443cfa51a44c6a0809a9a5024569e293ce7c476f8d0dbba88ff0c