Malicious PDF — malware analysis report

Static analysis result for SHA-256 da026588627f9062…

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 21:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d9e4e0f4b9f293dc979030e40350cc4 SHA-1: 88ab4aa033be8ad4fbb8375bcee6df606237f54a SHA-256: da026588627f9062bbfa7b0ee4aa06d31acebffdec5eacff17e174b1f1e34d9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://pronobile.com/catalog/file/jowuduruv.pdf In PDF document text
    • http://inistor.com/ufiles/files/zanowiputikekeb.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/91203660427.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/gogokaxananutusonej.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/96690353450.pdfIn PDF document text
    • http://orenprom.com/img/account/file/27501519121.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/wepufug.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/21990820839.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/21305115743.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/36539667429.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/zitavilojus.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/vazepukudejisapojokupaj.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/sk7h71euvnebd8bjc88rin71na/3623325331.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/debafapiba.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/vugiletufimebu.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/84032709806.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/dosudug.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/90013277447.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/mifovilikebisova.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/wirivumugemupeponeguwux.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/futivup.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/kisikeresuwubitod.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c60f1fbdc---gotewawavemuf.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/xumunovedivivewikivojijo.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/ketisir.pdfIn PDF document text
    • http://mobiliteit.nu/files/vajafoweximu.pdfIn PDF document text
    • https://wasael.com/userfiles/file/tadafopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sources+of+groundwater+pdfPDF 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_off0000dcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBC 18104 bytes
SHA-256: 8831792a5405cb62179060a85a570322ce3d43f138246ded98beb90357132373
font_01_sfnt_off00010bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12413 10916 bytes
SHA-256: 4e6ccaaae4123f03636f82fd66e843b18fdcb84c76779b1ec1b4f13829691627