Malicious PDF — malware analysis report

Static analysis result for SHA-256 245cfd7cbb25824f…

MALICIOUS

PDF

80.7 KB Created: 2021-10-15 17:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 28e7c1bfa68d4ff2b00debe7b03686c4 SHA-1: 2e53b44bae10fda99ba10d5ee1326ef5b11a85c7 SHA-256: 245cfd7cbb25824f1c0ea21d9c2239e37d5db0b387f6f811749e20d6f7c87ea5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

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://e-photosynthesis.org/userfiles/file/kerejutatil.pdf In PDF document text
    • http://hqshop24.com/userfiles/file/54198959694.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/sesowevoxagugogixegax.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20211008_204605.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/xutufevinibugexegilufi.pdfIn PDF document text
    • https://812423.situshoki1.com/contents/files/11957411448.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/dufuxikibifivixefiw.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/70348851295.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/3995306542.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/89225288664.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/2809knqifeglvabqjhd1mqk3se/kituwalomusapebexog.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/fikekunu.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/bizagatokejasalivati.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/naxazekafapegiki.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/94539023873.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/49057611078.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/86791493163.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/9698963405.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/82109131330.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/gutiwalilaki.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/fivowajirinememegub.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/fusibujoruxazupolino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/TSvcnjQ06Jg/uplcv?utm_term=redemption+coming+praise+the+lordPDF 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_off0000d3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EC 11008 bytes
SHA-256: 231dc3a98734618ba3fd6f30e77807c13b12ecef87115445dd7d087e8db5695d
font_01_sfnt_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 18740 bytes
SHA-256: 5680f054dcd8e3edf4fc6720abd5a26621f9870b5ff3d7bad6eb2e4429baf648
font_02_sfnt_off00011cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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