Malicious PDF — malware analysis report

Static analysis result for SHA-256 8daf7e53494fb76e…

MALICIOUS

PDF

72.5 KB Created: 2021-09-17 15:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0a682a8212e8204ed0d4313d75180260 SHA-1: 48f52a56513a1674d031963b3044f5aefe96e0d2 SHA-256: 8daf7e53494fb76e644de56f86498df034173b581e70529ed1a43e00b16ba628
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and the PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this, indicating a high number of links on potentially untrusted hosts. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to lead the user to external content, likely malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://icoachyou.biz/images/ckeditor/files/fikubavotig.pdf In PDF document text
    • http://ty-int.com/files/files/74083506164.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210914_5F8183278A7783ED.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/96644486539.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/92514170053.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/69i5o54pb97ipkalhb8gbjl4m5/bufizumedeb.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/nejupifomoz.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/59430155127.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/faviletirilejuza.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133b11085b95---dewafozevozes.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/pimazasowovanafutafulemi.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jomoturabilasa.pdfIn PDF document text
    • http://technocom.pl/editor/file/runer.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/pirokilobagofeseriwudorid.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/2892404698.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210904211338.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/5909099546.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/25844609744.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/motuwe.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/belazowa.pdfIn PDF document text
    • https://ratoempat.com/contents/files/milatamigiwogakaziro.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/fibulivulazifewafukeru.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/12418450927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=telegram+tv+box+apkPDF 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_off0000b850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD062 17124 bytes
SHA-256: 111c71bd4c0d49242369fcdf1f92f7a5286d638de9bd14132065c0141e25bbae
font_02_sfnt_off0000fc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7A 10596 bytes
SHA-256: b3c9ae3e8a15b1cb34decc85b904c2924a2a85fe4419f9fa6fb575f83cd2ca7a