Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4d073b380afebd…

MALICIOUS

PDF

70.1 KB Created: 2021-09-11 11:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 75f4b5316dbeb0fed99e10017b5d21d0 SHA-1: e400235ed13e3d9721ed0a0d1cc5d0296212d1f6 SHA-256: fb4d073b380afebd07d4206e93adc923523269c9c03c070ec2b6aef2e687d544
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the PDF is designed to host a large number of links, potentially to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://oniceh.ru/uplcv?utm_term=peter+and+rabbit+full+movie PDF link annotation
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/lavexamexepodivute.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/subuvubawonizevulo.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/46453721172.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/96957972006.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/15484945552.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/73589478899.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/84199975612.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/34528105345.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210908120919.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/57232753994.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/peleze.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/91948381153.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161321d07a717a---nukaz.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/30202369986.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/26873292573.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/33051607526.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/sumuponibetanuxasikarunim.pdfIn PDF document text
    • http://bienbao.org/uploads/files/xozewukofudilebozog.pdfIn PDF document text
    • http://ux-school.ru/files/files/89005849801.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/713418666.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_off0000afef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEF 16700 bytes
SHA-256: 1af23dd5cf128ac6e682603d91e05743c839f4ab9a8c61f14b611727d7ad65e5
font_01_sfnt_off0000db14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 10652 bytes
SHA-256: d78e113cc150fc05c32391a3753aa9538d2f995ec36697c300be33e1054dac4b
font_02_sfnt_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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