Malicious PDF — malware analysis report

Static analysis result for SHA-256 134db5f7c46cda41…

MALICIOUS

PDF

72.5 KB Created: 2021-09-09 03:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 39c3e2ef45e5ab8dff3d3d1b24a6c6f1 SHA-1: eff9014bcf7a5e1399cdd6c0bd9d3c2d4dcf456a SHA-256: 134db5f7c46cda418995ee9e8a51f6181ef4cdc6edd708961354cf4b69b7a2cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://mbfeed.vn/upload/files/wibapizimu.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec1cd34cd8---78990972278.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/062321239562.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/50499045005.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/kewizajimavuvuzumenozu.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/4117263361.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/5809319274.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/60567067856.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/29256452116.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/6702727305.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/95821854313.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/24014925365.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/30365961996.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/sigof.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/93f5bff6ea43835c957d47c8e8bf76c4/zawix.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/gegot.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/53536857525.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/86356188664.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/15322788355.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/fegugokez.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/81336773854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=prince+of+persia+forgotten+sands+download+for+androidPDF 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_off0000b5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DA 10884 bytes
SHA-256: 50aa2979bc082d14691d0429f2e0af57c60817ea69ee54d25786faf70b5c2e22
font_01_sfnt_off0000cefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFB 17684 bytes
SHA-256: 6a3f06bef2ca1ba8aaa4457ec3d13d67c443a34cb1b2053955a0d49b2f948fc8
font_02_sfnt_off0000fc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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