Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb61db922b3e8688…

MALICIOUS

PDF

78.2 KB Created: 2021-09-10 11:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c795168300a5bf103f09ba15ad6cc1fa SHA-1: d48cd2e8f940bc159713b43418602488adf68708 SHA-256: fb61db922b3e8688762c01be241ec84f951d30d655f9f4db9e9d392f10fb292e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to redirect the user to potentially harmful content. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://oniceh.ru/uplcv?utm_term=half+life+mobile+apk
    • http://krasneclanky.cz/uploads/72960553530.pdf
    • http://tentauto23.ru/ckfinder/userfiles/files/90595774606.pdf
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9384816969.pdf
    • https://sbsoftware.ro/admin/userfiles/file/ripisaretasunijikajufepi.pdf
    • http://daiichigroup.net/uploads/news_file/mijavowirep.pdf
    • http://cuuhoatudong.com/upload/files/jepezeselusowu.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/jogemiwaz.pdf
    • http://gartenstadt-apotheke.com/userfiles/file/dakukagavopuzoxusuxu.pdf
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/51648960561.pdf
    • http://www.520amis.com/upload/files/27977275014.pdf
    • https://monyetjoget.com/contents/files/79605997901.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139377bd60cd---89624342946.pdf
    • http://holcom-wd.holcom.vn/webroot/img/files/44667074474.pdf
    • http://namngonviet.vn/user-/files/rusaxakafojuzar.pdf
    • http://zabbeleecooking.com/ckfinder/userfiles/files/42655015878.pdf
    • https://blugarden.eu/file/66378337407.pdf
    • http://box8websites.com/ckfinder/userfiles/files/zotaxatamobawu.pdf
    • http://foxgraphics.paulsfashion.in/files/jewegar.pdf
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/sopijifojadot.pdf
    • http://hglobaltour.com/FileData/ckfinder/files/20210904_D3C42BE67A22BEC0.pdf
    • http://jarauwerdaenzn.nl/userfiles/file/54518838745.pdf
    • http://tydafa.com/dafa/uploadfiles/20210903230037.pdf
    • http://shippingengineering.com/files/ckeditorothers/nolena.pdf
    • http://ducthanggroup.com/webroot/img/files/guduf.pdf
    • http://kapsalonindex.nl/images/uploads/lilajorewosunusutakaf.pdf
    • http://lngpetro.com/userfiles/file/60888967091.pdf
    • 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_off0000cf58.bin
5adbc9262523bab096f19503b1b9840fa6a9e5e2e633a32872ce78aab20a73c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF58 17164 bytes
font_01_sfnt_off0000fbdd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 16792 bytes
font_02_sfnt_off000113f4.bin
3abe96715ae85952807b7e2080c0322650eb1a0125a94a9fba379eb1681ff0ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113F4 10272 bytes

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