Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcee13b9b47a502e…

MALICIOUS

PDF

88.7 KB Created: 2021-09-09 07:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e95e90438c01e894b35a1749919a91a1 SHA-1: d9b3c3c576f4959a1357091c4e41a56e393a2eac SHA-256: bcee13b9b47a502ecc7a9201ba34529e4c5bc7e9629617e945eb5c75a3f22acc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a significant portion pointing to a link farm hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://beerskiboot.de/img/upload/file/zipogaxazukuzogunu.pdf In PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/86843423657.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/lusud.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/9447598385.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/dedunasodanagubawuzul.pdfIn PDF document text
    • http://evola.it/userfiles/files/pemini.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/kegapebukipe.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/vozegobetuj.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/mivudomonevidonegufujebe.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/5270055241.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/73514494390.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/35541552412.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/40573743264.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/18183939075.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/98897725003.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/tejikafobijo.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132a5e7eb811---54964557812.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/ludikunodavubifemunuvug.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/50024455748.pdfIn PDF document text
    • https://media-get.com/userfiles/files/37581969788.pdfIn PDF document text
    • https://avflash.nl/upload/files/satavororozuxutowi.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/98768931956.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/rofipapomagifedupaxize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=describing+motion+distance+and+displacementPDF 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_off0000f685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 11000 bytes
SHA-256: f2c93883fedca037ff3e9015acb46d476877a52ec4e9dd774bfe1f6ac844e349
font_01_sfnt_off00010fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA5 17304 bytes
SHA-256: 28dedf3960a34e6d14e358129216df0daaa182f89ad904a2b3f826d376dcb0b7
font_02_sfnt_off00013cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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