Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1186a63e88cf933…

MALICIOUS

PDF

89.4 KB Created: 2021-09-20 14:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8bc8d376de6ca33aebc4d09cc835e478 SHA-1: 85a2bcbb6d8186c8bcd583a546c08b443824ee03 SHA-256: c1186a63e88cf933b04794f21b40518266dbca023e7f489aa5e503c8a3b67387
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, one of which is a link farm designed to redirect users. The heuristic 'SE_URGENCY_LURE' indicates the document likely uses urgent language to prompt user interaction with these links, which are suspected to lead to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pixomot.ru/uplcv?utm_term=dragon+ball+z+season+8+episode+28 PDF link annotation
    • https://domilot.com/uploader/files/86936439082.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/5432478847.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/kanawow.pdfIn PDF document text
    • http://citranco.com/users/files/kuvawukamevofafuzorilem.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/5682419006.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/3542090152.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/wilebenumuj.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/49863358438.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210909_E3B45092C72A0D3D.pdfIn PDF document text
    • http://e-photosynthesis.org/userfiles/file/darumi.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/revele.pdfIn PDF document text
    • http://knipia.com/userfiles/file/74424734303.pdfIn PDF document text
    • http://446888.top/userfiles/file/13658689748.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/wopikopi.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/7532076940.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/tovogofuj.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/22518779499.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/gegugosexisokejakulas.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/mexezafifamovibexuzu.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/buwebubopegizovum.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/xadawegivaxofek.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_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 18024 bytes
SHA-256: 95c7ee980b06b0fa498c3c7962db337e8cdc3fcb94bac260765c282ca8ae09de
font_02_sfnt_off00013edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDC 11000 bytes
SHA-256: 95dc13a6ec67243653507ade3005fe4b846dbc8395b855869d7835dc87ede86d