Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3760a83a08504a…

MALICIOUS

PDF

70.6 KB Created: 2021-09-29 09:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 682d8ba1e9810d4d01cbe695f8f37a1d SHA-1: 618a43ae8cf33e71c76da5726a44df891795121c SHA-256: eb3760a83a08504afa034320ad4af1bb02a0bdd6a2d78dd7ee273fef177c5921
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it's a link farm on disposable hosting. The ML classifier also flagged the PDF as malicious. While no scripts were directly extracted, the structure and numerous external links suggest an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

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://promtour-rural.ro/userfiles/file/92521389092.pdf In PDF document text
    • http://security-m.jp/tool/images/file/91325490640.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/80693471ca3c2e0d054cbba3575e2038/17724818929.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/mapige.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/toxebodezofebizewiduxuw.pdfIn PDF document text
    • http://precisao.net/files/files/kufusaluronewuto.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/12019295559.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/pafuxaru.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/tosamoselozusutaw.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/xadapiwanul.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/dojerifozejojutez.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/nakadazil.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/92030313059.pdfIn PDF document text
    • https://timminsrenovations.ca/file/WCxUbNLt4AYbaF4X.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/22988231739.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/xutefige.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/lumasojedupabagakomatuwiz.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109072258243143.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/72845341331.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca2121fbe3---tobiwutifitipezudiv.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/tugetowaw.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/makotigopadepevixo.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/sofevujagigeval.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/welugilekilejoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=8th+standard+maths+digest+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_off0000b0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DF 17080 bytes
SHA-256: 43207e3c67882e393488cabb5cb2d10a844874362aec9f54e9c6c7dfdf63565a
font_02_sfnt_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 10892 bytes
SHA-256: 8ed209b4df010e9b45c0a177a4f5c2c0cfa7cd329e6185d1b0b6626f11505425