Malicious PDF — malware analysis report

Static analysis result for SHA-256 085e9225412af11e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 03:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3ff3aa859d52b9c72b7e30cdfc7a65f8 SHA-1: 1106398f8137536214b59f16ed67d508d3a59a6f SHA-256: 085e9225412af11eb2ab1d8c2b7c9e92db7f9680921313fec0d476601c85b7a6
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 explicitly extracted, the structure and numerous external links suggest an attempt to redirect users to potentially malicious sites, possibly for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://restaurant-lyons.fr/userfiles/file/73783492208.pdf In PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/15850554256.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/45118160385.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/febewonuvokefugotaj.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/velated.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/penokajepaparobu.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/sofenoget.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/jekut.pdfIn PDF document text
    • https://cncunse.com/d/files/regesezowavajekos.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e714abb86---vawebomuniroxulikemijevin.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/fosalexaforujupeku.pdfIn PDF document text
    • http://polkovnik.su/upload/file/32589348890.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/muvazolapuxaxusakaxuna.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210908230601.pdfIn PDF document text
    • https://krusomying.com/data/file/wikikovisujeze.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/nevonifopiriliduzodegoza.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/rumogutigeno.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/11224786096.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/64421488456.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/sugekivu.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2388156fe---tugufekumi.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/29548428806.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/fezapupovobub.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/nesutogokuroleni.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/jubuwasomiramumaxaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=motorola+moto+x+manualPDF 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_off0000d15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 10072 bytes
SHA-256: ca21767e5a80353fc18104d4eaa47718c25537fed9fbc9a2939900a74305c89f
font_02_sfnt_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 19680 bytes
SHA-256: da8b70551ee8e12260a06785a9e11a77e8997e2841d648dd74b9eb7f18afd614