Malicious PDF — malware analysis report

Static analysis result for SHA-256 eebf61acf0faf420…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 14:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b041126b8feb7a991866a12c4c3b7c0 SHA-1: 7dc5b0da97a3f38ca53e25798ac9c62553bfc1dd SHA-256: eebf61acf0faf420b56bfae826ed7a1f0b41e5bd511c85aaab3e2b1ea4bb73e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are structured to appear as legitimate documents but lead to unknown external sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of creating numerous distinct links on disposable hosting, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=2012+holden+cruze+workshop+manual PDF link annotation
    • http://irk-yoga.ru/upload/files/dawuz.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/zotoxoxavuwivijapefoto.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/5776578180.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353dad416d0---45085838872.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/35412058301.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/33198328255.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/jusiviremutisara.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/memenexexominiriv.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/nikofazuritofamuzuf.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/jipokokilorupuvukoguw.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/zasatamolu.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/26794693196.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/dusakulomalununuwekofan.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/2sr43lmiv7q3eah8g8has14un3/26156408467.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/20720233709.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/18993692751.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/61249192227.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/dekewejopelopel.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/fufoxusilinokitiluzeva.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/35645581298.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/tedure.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/64808704497.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/zumexosa.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/xiwabagodim.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_off0000d631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD631 11124 bytes
SHA-256: 6b0631a652d08f7ff5440c04a6e84991c72859a8685d7e589879d2ca807363f3
font_01_sfnt_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10832 17748 bytes
SHA-256: eaaaad3fe4d76d401a628d701fdec4b2e1f7903464e75d52ff25290b834530ba