Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5eaa08cab785f26…

MALICIOUS

PDF

70.9 KB Created: 2021-09-19 15:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 87d370cbfc96e993869e32a28247a270 SHA-1: a1d0aa074cda4e8a108c544ced41e25f5154107a SHA-256: b5eaa08cab785f26acca71921dc4dcaaeaa2cf6058b7c3d098f85b4cb182f93c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded links, many of which point to disposable or suspicious domains, indicating a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

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 https://rimi.sk/userfiles/file/ravoxagozanedigukopozodub.pdf In PDF document text
    • https://edarky.net/data/file/29906000441.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/sogovafavobuduromok.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/97946250790.pdfIn PDF document text
    • https://digireg.pl/upload/14493260774.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/40184083480.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/sojoxajoluwivumawiturok.pdfIn PDF document text
    • http://laduses.nl/image/file/35298526011.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/zunugibulaxominanobuwared.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/35224010630.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/55858819746.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/56096127868.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/78685375911.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/97253425334.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/50533630787.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/komixep.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/22b245gkd3f8akn354166r06f2/rilezenajijerixosax.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/todewe.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/xewivokuwigowuruwoba.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/rujoval.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/xitowudiwomabonuxubuvumaz.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9a9de43f6---toduguguturisikazakumal.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38150792236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+my+contacts+from+icloud+to+androidPDF 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_off0000b424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB424 15444 bytes
SHA-256: 63a3854cabe2fc8d6f45d03525e6ce3b7fe0d530f2d53bc2cbf490e2d8e46751
font_01_sfnt_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 11112 bytes
SHA-256: d742330dfe94cfba9e2c9ba0c4cb799545923774049f2172dc140d8083a9ba6e
font_02_sfnt_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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