Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af0fb4a6faba1f7…

MALICIOUS

PDF

95.9 KB Created: 2021-09-18 21:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3562591ddaede5f9b52920782418c743 SHA-1: d381b5d5479bb6012b74bfcc918e1adda261a27a SHA-256: 6af0fb4a6faba1f761c3e573bc4e4f3e0a95565902d18d12d1bfb848814fe027
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or content distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent related to SEO manipulation or hosting malicious content. No scripts were extracted, but the PDF structure itself is leveraged for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://hybsch.it/upload/file/visekevapobifonusuvofaga.pdf In PDF document text
    • http://tipsclubcr.com/campannas/file/bubezo.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/jomosolilas.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/kofepejosufevibam.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161430b3e8713e---zefivojo.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/lolosotipurotawumelog.pdfIn PDF document text
    • http://digifast.cz/userfiles/68415066444.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/fidemipesufigadosukisusek.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161365e7ba3a65---49240732809.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/fesedomodazusux.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/zesexipo.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/woxurukivupolepi.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48502593870.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/rajutuwakewunugi.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/gaxafugo.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/pemunazululixi.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/pojowowudufisetuxilupusan.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/47315574336.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/lufigudid.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/65766138602.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/nosuninuwasomoxoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=coolest+android+apps+2015PDF 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_off0001129b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129B 17736 bytes
SHA-256: 66899115cda072a7c2be9c9f740e549d69a5b08f75dc5c9f513b5b271b62d7d7
font_01_sfnt_off000140dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DD 10844 bytes
SHA-256: 3bc8537c06ab86a5ad4bffc35630e423cb6fb87ea4d67b82dccb66ffc8aea5d5
font_02_sfnt_off00015a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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