Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f43f94bed6cfc4d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 06:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 81848e4802f6d3d5818e50c055c312a5 SHA-1: 75036717407faed131b4645a7304a1ca33948873 SHA-256: 9f43f94bed6cfc4d38911311e9210b6139905027b1fc8f5d8d06dfc573844795
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, with a notable heuristic identifying it as a link farm on disposable hosting. The ML classifier also flagged the PDF as malicious. The primary attack pattern involves directing users to a collection of links, potentially for SEO poisoning or to serve additional malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oreopay58.com/ckfinder/userfiles/files/92275316651.pdf In PDF document text
    • https://berettyotv.hu/userfiles/files/tasedebusawe.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/jezixudup.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/38197279929.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/zulaveporum.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/dd7f0672778635684db4b2a718f90cdf/38785524680.pdfIn PDF document text
    • http://viettruss.com/upload/file/jifosinalin.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/25761448424.pdfIn PDF document text
    • http://consade.com/userfiles/file/25887768897.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/pikibarimezodum.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/49170870408.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60829988998.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/64141082076.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d835aaa168---potowokuxop.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/lategiput.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/38911844173.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/30600600431.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/jufebovarofititunileka.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/vodunera.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/2288947526.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/60778595003.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/tivikebidurusitufixaz.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/23226581872.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1614049f9110a9---fudizumolefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=lego+batman+mobile+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_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 21040 bytes
SHA-256: 067d7ce08f0891b76539856f4b2dda2362655d1f55859949383183fbbc67e6b0
font_01_sfnt_off000112e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFB 10516 bytes
SHA-256: 28e170daf093953bd357b355bc4aef625d3ea509ea8990f8a71cd9098c88a3e8