Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fddcc605eab0d85…

MALICIOUS

PDF

91.4 KB Created: 2021-09-15 11:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2027ce77d096b6e56f4a8643f91c45ea SHA-1: 0dc21a98b55ed87bcdd006c61029e172acf7e69a SHA-256: 9fddcc605eab0d85e8a7d8e810ef00b6feba4076ac681b6d2267c057ef07c8cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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 https://oniceh.ru/uplcv?utm_term=watch+quiet+place+online PDF link annotation
    • http://zhfangyuan.com/uploadfiles/files/91476208325.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/bamasanapadexusilixa.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/jarorezubegidi.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16132b74148c20---18547024515.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/gabojilirogate.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/4773216114.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/jemebetafaluk.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/54655524681.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/pexaxutusiwe.pdfIn PDF document text
    • https://geloracinta.com/contents/files/jipexelubimefozoxafo.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/rixetowujo.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/kakataru.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/15203340830.pdfIn PDF document text
    • https://kueapem.com/contents/files/baxodetafilaselij.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/dubapovora.pdfIn PDF document text
    • https://renault-service.com/userfiles/77473414951.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/9c814c970a3929fcf39c80bc6be5db10/nitin.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/55836123070.pdfIn PDF document text
    • http://vuason.vn/upload/files/sogoluvedilunovireroruwuz.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210902103512.pdfIn PDF document text
    • https://equimat-cheval.fr/file/wofulewefubigipise.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/xuwajole.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/ziwokegijanoxidovuxesa.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_off0001012e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11945 10440 bytes
SHA-256: ea5d9c601f2a4715e00a16b070398469cbe285084291f9dcc3dbcaf9d81743a8
font_02_sfnt_off000130e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E3 18428 bytes
SHA-256: f11b5f8bb6d19412ccf0acb39307641f4416003076cac0e0a8d9138361ec7375

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