Malicious PDF — malware analysis report

Static analysis result for SHA-256 5769f8724b52c314…

MALICIOUS

PDF

88.0 KB Created: 2021-09-13 23:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d359276fa31d796174ec0e340755184a SHA-1: 637cd153a11ba491b32967f220352e6248624db4 SHA-256: 5769f8724b52c314e21b253aaaec5002ce5f4d61106f55c9ef2a7ef379a37ca0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, with a high ML classifier score and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to obscure the true destination, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://tiszaladany.hu/upload/file/52929575838.pdf In PDF document text
    • https://armature.ir/cache/fck_files/file/totidekelo.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/mudonowesuvizijafu.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/zoxunobavowubewukodome.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/davevijobutaluzidalogor.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/pipamojokuwotuj.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/rilumisololito.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/soropejubijuxisazopuso.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/mobabigiwejakadisofe.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/43746704626.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/24346825604.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/75758015339.pdfIn PDF document text
    • http://perksys.com/userfiles/file/bajezadamexepowel.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/bikosutuj.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/49569213992.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/mozitatidovobizawug.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/jamapufizowu.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/tilorowunupit.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/lemotivudof.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/7714109442.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132c8598f5a3---20474476447.pdfIn PDF document text
    • https://ottopianos.nl/files/xarojofejijitubolamowibek.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/7475506080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mi+tv+stick+airplayPDF 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_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 18652 bytes
SHA-256: d27e5e9f41cb62135251fbdb002cfda3fd84400fcce8a5f9945a68deb405b36f
font_01_sfnt_off000123ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AB 10276 bytes
SHA-256: db40d23c3207e31acf765fa70a49d2bc3c52e4ac9604f48f18e54623ba6355d5
font_02_sfnt_off00013afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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