Malicious PDF — malware analysis report

Static analysis result for SHA-256 595d00472a457179…

MALICIOUS

PDF

83.5 KB Created: 2021-09-24 06:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a66b06cd68f45bf2e56af56d0a55fd4 SHA-1: 0fd2454e4d5ba2b2b4ed4d8d0afa74a9ed3f87de SHA-256: 595d00472a45717996561466dc8f49f28d8661f73650780f367cebd735dbe60e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to a link farm, suggesting an attempt to manipulate search engine results or distribute additional malicious files. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://iehyun.com/editorupload/file/65042654185.pdf In PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/xelusilufalokefulivebo.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/xebobajukutiwus.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/16781623674.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/59712298557.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/98299021823.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/zowumomagumaxorev.pdfIn PDF document text
    • https://norservis.cz/files/files/vofoz.pdfIn PDF document text
    • https://bolahijau.com/contents/files/peziwedezuvux.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/dafuvimojilapos.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/jalogemuvefot.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/ruworixukajomikusupilodu.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/68261679194.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/11567988191.pdfIn PDF document text
    • http://precisao.net/files/files/sinafikabozutabale.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/kixafisejedaxaw.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/40440129060.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/61041987690.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/zufodamelilonene.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/23791074481.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140b2f52e857---komafegepa.pdfIn PDF document text
    • http://punaide.com/userfiles/files/kemogivunitusuz.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/zetamefofog.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1614979a5b1242---bujatujefufotudezabero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hotstar+old+apk+freePDF 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_off0000e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 18436 bytes
SHA-256: c93d07a793c487f00fabc2141f001300a55ccf2b210fefc9cf2f8b01f9161588
font_01_sfnt_off000110ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E1 10380 bytes
SHA-256: fbf10999295ec66f030a15a7e92e7025f2709d8de2b7146b97d25b754fddcc2d