Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a9d0e5d04d4645…

MALICIOUS

PDF

69.1 KB Created: 2021-09-18 03:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 62b7b8de4420fc284c2c437e4feab871 SHA-1: f6f737bf8fa3e5ad527a43ec2690562ae564b6d5 SHA-256: d8a9d0e5d04d4645f72080b3f32ac3a7bdbdf3fd55ab0a7e9e0449c05d28ac77
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains. The ML classifier strongly indicates maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the document's nature as a link farm designed to redirect users. No scripts were extracted, but the sheer volume of suspicious links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 4

  • 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://garglob.ru/uplcv?utm_term=android+animation+transition PDF link annotation
    • http://tw-tms.com/uploadpic/xw/files/80821186660.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/1480238993.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/fiwedivupoxuxejomuw.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/megava.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/vulakekovima.pdfIn PDF document text
    • https://krossi.ru/images/content/files/rapoforuwosofalurudek.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/sikurisotokupaf.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/57252712342.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/55729306609.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/finovegadedabomugupo.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/88899242692.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1630590120a0437c15ef51a5cc7f2d.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/97668413435.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/28820934324.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/sukoxipanorunuguvebeve.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/h1jl8v6l85iggqgvdfu0qhidfl/fijudafoxukuma.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/10713675302.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/28465207064.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/20445902721.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/449621419.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/29787585512.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/wuwilitewumolike.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/84448710750.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/25713314735.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_off0000b22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22A 14784 bytes
SHA-256: fee55adc9f384dd247a72eaf92374f364061d2184e4ecc544350a4d59f8887de
font_01_sfnt_off0000d7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 10212 bytes
SHA-256: 8656298fff9f4cb1266fd3364e8bc96f5164a3864582096ba1d5c438478b7fda