Malicious PDF — malware analysis report

Static analysis result for SHA-256 c349b1da135f7435…

MALICIOUS

PDF

72.8 KB Created: 2021-09-17 05:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9f2de8b6dff30ca8d4186808a9d9245 SHA-1: 14e49ef02df9e59b003b9396bfbcd6e05260f075 SHA-256: c349b1da135f7435f001d8de08440ad1909730ce010eef3a22fac16a49c256ce
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a high number of embedded URLs, many of which point to disposable domains and are structured as a link farm. The ML classifier also flagged this PDF as malicious with a high probability. While no scripts were extracted, the sheer volume and nature of the links suggest an attempt to lure users to malicious sites, likely for phishing or to download further payloads.

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 http://skonasystems.com/userfiles/file/fejinubuf.pdf In PDF document text
    • https://doluhosting.com/calisma2/files/uploads/gosilafaluwa.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/refufagubezo.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/69993377521.pdfIn PDF document text
    • https://mar3ol.com/Files/files/xinapowegu.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/merolulokax.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161418af23a8a5---98993213636.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/17502758302.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/dobul.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/nopepilevezot.pdfIn PDF document text
    • http://ed-union05.ru/files/file/dedixogopiwogovi.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/ligirejesojajefo.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/zijev.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/degefexunurun.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/vuzagewejokin.pdfIn PDF document text
    • http://domplus.su/userfiles/files/46202301912.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161411a101662e---kokezak.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/44114414026.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/69619383954.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/lepolegodiwutogax.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/60608262798.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/1928098741.pdfIn PDF document text
    • http://keramann.ru/uploads/files/44480416562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=transfer+files+over+wifi+androidPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/zodamapumelediwuvewavejiz.pdfIn PDF document text
    • 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_off0000bb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31B 16676 bytes
SHA-256: 1f886779a8712ed608e17a4aa57dcc34a407a338a8204dcdd657d781470d924b
font_02_sfnt_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 10364 bytes
SHA-256: 433a7c1d793551186af70d72b4e09e8d0283340f6034145be61229df3a7f4a24

Open this report in the interactive analyzer, or submit your own file for analysis.