Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9ed9253402e375…

MALICIOUS

PDF

84.9 KB Created: 2021-09-16 17:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0f34ca70c2f30092f7d7396488336260 SHA-1: dc1928880eb8d6c30d822ffb380ec8b7b1a47dff SHA-256: be9ed9253402e3755644f5d826bb501b6b3c78375293f3cd08bb17457b1b407b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are flagged as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=past+continuous+and+simple+past+exercises+pdf PDF link annotation
    • https://m-astar.com/UserFiles/files/kopadepizabutesokab.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/5933040079.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9c14c8693---25394571393.pdfIn PDF document text
    • http://sung1.com/upload/files/95492665497.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/27115165095.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/ruwubixefanebavuviwaj.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/679674954.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/37245406104.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/lejerujimibeso.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/80684021375.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/fobiw.pdfIn PDF document text
    • https://termofriz.rs/files/68713585786.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/fubobus.pdfIn PDF document text
    • https://ibextrail.com/editor-images/59510344362.pdfIn PDF document text
    • https://majubesar.net/contents/files/kofiduxujagusupinosazin.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/sofavonifafuzafotubugim.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/84640814688.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/21164210820.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/46868578167.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/pagowitarikoxowofilepuvi.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/galojewejarev.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/digelurulofefi.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_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 10984 bytes
SHA-256: 33beb42fe58c551e40868b48d7c33b92c91a68a84e95e4dc4e0da44665835e19
font_01_sfnt_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 18624 bytes
SHA-256: 3887f135ae2178cf3156022820cda5a14de42ac45027749319bd8f220b0b69a2
font_02_sfnt_off00012dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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