Malicious PDF — malware analysis report

Static analysis result for SHA-256 d288012957131a8f…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 00:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84dfbafcb69d5a424a1d1907d62e9717 SHA-1: b5cfccd7fa19ff6c7d902cc24fc28f699ecb0419 SHA-256: d288012957131a8fe8962cf040d367c0f4fbf03fd0c0742cabaa0351823b1163
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting an attempt to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://stnicholasway.com/userfiles/file/ravesovozazapasororogan.pdf In PDF document text
    • http://dinhvi5s.com/images/newtech/files/80214156381.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/87793277475.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/98327112255.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/widegafuxas.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/lufenuxiwaxadavofatida.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/lirixonukalolorodenubid.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/94591210581.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/lijifarubepagumopaxalotor.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/karovujubuwokolibijipu.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/toviwafomube.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/jiwexikulozi.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-6/20210906125813231508.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/33510645205.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210901132143.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/darexovubujufumu.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///gusukekalukonunedu.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/boxutagadisowupobapesif.pdfIn PDF document text
    • http://cissi.it/userfiles/files/24684553038.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161319c06df599---gufetoxofonor.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///busulagononipaz.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/7879195052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=greys+anatomy+gomoviesPDF 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_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 10624 bytes
SHA-256: 048b57e33a0c2046082bcad1dd729ebc28ecd4740379e3d9dbf7f6bb69eafee1
font_01_sfnt_off0000eeb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 18028 bytes
SHA-256: d2cf918d1baf481aa63e4a0bfd094ed094e18642438b94584a430893cabf57f4
font_02_sfnt_off00011d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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