Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b3e2c30ef5ad25…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 02:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 00303ab09665bc0ad499441e2ba20e22 SHA-1: 171d005266594fc3bc2fea52a3f0d571bebb31fe SHA-256: d2b3e2c30ef5ad25cf155a3b547a1f8b7069747c88b5bf53cb377767f8124b39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://envida-nieuws.nl/bsb_website/upload_fck/file/tuzifipuripigomi.pdf In PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/55149750618.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/10285442234.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/nabejumelokol.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/36729390669.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/kurub.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tiluj.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/topokagetupowunasotekaju.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/95053438540.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/42984780121.pdfIn PDF document text
    • http://abwva.com/uploads/files/wonakobikesovufo.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/vutovet.pdfIn PDF document text
    • https://andana.us/files/files/litelusik.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/29268646901.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/45495040064.pdfIn PDF document text
    • http://ellev.fr/upload/files/pukazosusar.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613495dc93454---dujexotub.pdfIn PDF document text
    • http://boki.hu/editor_up/pebulozajopenag.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/54177657748.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/41088355360.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/67536441410.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/dekalukubig.pdfIn PDF document text
    • https://khanikango.in/file/defajisivifigekizofadiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=play+store+is+not+downloading+any+appPDF 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_off0000d69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69A 17432 bytes
SHA-256: 4dd84d42ed05ee29851f7f4363a77a6b48f46eddf3f2af6975d2af58af57c5c3
font_01_sfnt_off00010399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 10768 bytes
SHA-256: 8b28455609e6052b3f9d2b0a87548550e0636272b3dbd07afe6a834a8dcdad99

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