Malicious PDF — malware analysis report

Static analysis result for SHA-256 3560051233a9b750…

MALICIOUS

PDF

79.5 KB Created: 2021-09-21 04:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b4b97f532e4e9012621faac79781817 SHA-1: 7b1b7e1d7a433b09c09d246d28be87bd85d50304 SHA-256: 3560051233a9b750626de4d6b97846da3db08ff7d52c3ec6b03bac51c8cf84ed
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier also flagged the PDF as malicious. While no scripts were extracted, the presence of many external URIs suggests an attempt to redirect the user to potentially malicious websites, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://leebyenghun.com/new/upload/board/files/90627475542.pdf
    • http://gramercy-grand.ru/files/file/20134899920.pdf
    • http://hawaiisushi.iorderfoods.com/uploads/files/11575755776.pdf
    • http://positiveforce.in/uploads/files/setoseb.pdf
    • http://peoplefoster.com/pliki/fabuvelotizater.pdf
    • http://kayapalinakliyat.com/file/55626168968.pdf
    • http://orderbestwings.com/uploads/files/59188967571.pdf
    • http://filipdegreef.be/uploads/files/20812639790.pdf
    • http://razaviota.ir/basefile/razaviotair/files/51835576560.pdf
    • http://teplospectr.ru/images/files/remujolamuvovilumejokaja.pdf
    • http://duonglaohanoi.com/userfiles/file/62674919749.pdf
    • http://defhjdrjioo.friend-match.com/upload/files/vamanuromodinipazawu.pdf
    • https://budapestpainter.hu/ckfinder/userfiles/files/rowasuwipilejono.pdf
    • http://umrllc.com/userfiles/files/fivifez.pdf
    • http://mijn-nederland.nl/userfiles/file/76520241615.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/94727770959.pdf
    • http://tythb.com/uploadfile/files/61244570295.pdf
    • http://jlm-kg.com/uploads/file/26583936562.pdf
    • http://klenderbio.com/upload/files/65709555568.pdf
    • http://agataklimowska.pl/userfiles/file/kefajevixituvowabeg.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f41239ed65---37829821583.pdf
    • https://wronba.pl/uploads/wysiwyg/file/vuremabegu.pdf
    • https://www.andreivieru.com/ckfinder/userfiles/files/55039339791.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=install+kali+linux+termux
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d02f.bin
bcb8b8ec6902423736e7a5c7cd69a470282fc151b43b803c6e44d4719cd66824		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD02F 18616 bytes
font_01_sfnt_off000100fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 16792 bytes
font_02_sfnt_off00011912.bin
cac67b82bbb31d03cf1d539748a55fe430aaf1cf709b859443cc6ae1e83a7c9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11912 10392 bytes

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