Malicious PDF — malware analysis report

Static analysis result for SHA-256 5096edb95708cbed…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 09:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a7c602387761b115366426751680724e SHA-1: 0f5b5faedd3d38cc514061790114bc0270d06343 SHA-256: 5096edb95708cbed3e7585a39a99f255bf7d3f9889ba4f69ed0a9a8c2dfaea55
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to obscure the true destination or distribute malware/phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=pathfinder+familiar+character+sheet PDF link annotation
    • http://rafaelstore.ru/upload/files/videsoseturalitip.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/zajep.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b5176405---piwofoxapefobodekupokegiz.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/71643522679.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/40899767830.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/72861188380.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613064b73169b---gizab.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/buwidunirurigiri.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/fufudojogiwubamemutukodi.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/7695724341.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/25118118283.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/kusajufibegilugon.pdfIn PDF document text
    • https://onwater.my/uploads/file/zapafaxusemesujolagexoxud.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/kojileri.pdfIn PDF document text
    • http://nenorm.com/files/files/mivojawerapudujefaxuboxo.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/masak.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/zigugigajereputonate.pdfIn PDF document text
    • https://tl-systems.hu/files/files/donogutipu.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/semefuvadolitibelejef.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/bugemasolojoleji.pdfIn PDF document text
    • https://susta.vn/userfiles/file/87115181073.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/buxewixomoz.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/bibatafexide.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/lizutegudowuleke.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/18818752855.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_off0000d4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 18748 bytes
SHA-256: 7a5afc9eb425c6c5998fd888e0ada2c9eeb8d776daf7e7311b76a9e685c8ee00
font_02_sfnt_off00011e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8A 10624 bytes
SHA-256: fe8ea6fe6cd4841f0c9f6864f19a265fcec2d8ac827bfc021009fa51503de9e8