Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8cfa4fb6484984…

MALICIOUS

PDF

88.0 KB Created: 2021-09-20 20:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c942978dd158b50e1719ab9a39c2c66e SHA-1: b5c0f451087dc685eed043eb932e8c764bcd7a4c SHA-256: be8cfa4fb648498441abfe4b59b312177c75ee500eaabea4f22553068abfb9c4
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs further supports this assessment. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://motovelo-nmsk.ru/userfiles/file/9931644004.pdf In PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/20827515763.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/nebezobov.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9b9101fbe---9445079592.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/jagonoxudikewadusameto.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7c5909e93---24948504786.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/13560559785.pdfIn PDF document text
    • https://digireg.at/upload/wulakidibedajefarasafit.pdfIn PDF document text
    • http://citranco.com/users/files/jakopalixexenewawisupelaw.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/6060777614.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/kowejonesenugitefofilebe.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/43427224723.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/fojuxemi.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/nekifus.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/10872072289.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/15397509473.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/21767702929.pdfIn PDF document text
    • http://qdjshg.com/files/file/nabuninaromujonekam.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/87610588574.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/91605368683.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/gupopalotivinilefir.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lesoxoxuxexuzemi.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/91658614961.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/dixizojuxubuzixijamorige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=first+demon+slayer+moviePDF 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_off0000e756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE756 22384 bytes
SHA-256: c6b12b55ebb1ec480498f6c26457464dced3412918b61a6fc2d75e69520f0f15
font_01_sfnt_off00012204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1B 10568 bytes
SHA-256: 94618d97731c702724160e3f10267a1b4ac19a46edb307a621ce450b8e24749c