Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe73616d143d869…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 11:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 464f59a10a2da34d3979c03e2c57b054 SHA-1: 01540d15f7f8a823c978b32a3a949d4b18fb521d SHA-256: dfe73616d143d86949e57aa1157bc6c48faa2a9e8a790d4f20f4a76fba87f09b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and are used in a link farm pattern. This strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of the file, indicating it is likely a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=how+to+move+contacts+from+phone+to+memory+card PDF link annotation
    • https://glaze-metalart.com/upload/files/80010607903.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/2109121414260513468cf3v.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/84783220730.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/lozom.pdfIn PDF document text
    • http://annabarons.com/files/files/kotawalapugovumijijuki.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/33954797705.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/gasalopebufisa.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/xalalulikekenawowarilefiv.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acf25a30d8---17202646621.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/liroronefibijuwaduzogal.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/99373222727.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/dabapojep.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8640e275dabe4bb829442d3f21fa6458/bowipuxawufol.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/71844414712.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/27965543439.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/fivomulamudewedibofom.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/57843915893.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/18740898217.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/mefokur.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/66891891982.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/40802624050.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/towifetatavapogoja.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/60239286289.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/gidag.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_off0000d5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 11004 bytes
SHA-256: d1491b72234aac5e8559a970ed1cab9230c9626b70a1eea128c7d16f93815098
font_01_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 18060 bytes
SHA-256: 449d871444c5f5a476faa6b81be398ff900ba1240bce1487711f7838fb1870df
font_02_sfnt_off00011d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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