Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf31006e7f1f062…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 07:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d9b147b64bfb9c0ee065d18cbb7b2cb4 SHA-1: 8b13c1e348f85be240df9544fad31429daa200c9 SHA-256: bbf31006e7f1f062f96e853d78b558670ce4590939944af4e83c938f3d118823
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://fratellibeninca.com/images/file/tezakegeserijasawuwaj.pdf In PDF document text
    • http://honghuibio.com/d/files/34101083107.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/85929358810.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/90717401598.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/69233282326.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/sifiwazudugitasuvax.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/lunose.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/20433338968.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/zamavinisat.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/bureje.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/39996469035.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/61555254172.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/53484330952.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/nufumolad.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/momeva.pdfIn PDF document text
    • http://4bx.pl/public/file/sitozixinopemilurevag.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/sozinabuzezubipolabivu.pdfIn PDF document text
    • http://zamgph.com/uploads/file/021457522894.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/pusenavapokiduzinemapigo.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16136824610da7---daborobivulupetiputusepis.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/e44d8d024ceafc32a2fe13016a764043/11418922298.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/o94be5vtu1d88g4076tla9kgj4/98563845748.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/97391782283.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/dezixoge.pdfIn PDF document text
    • http://princeverma.in/uploads/files/31204184353.pdfIn PDF document text
    • http://ustunongel.com/image/files/jenorunepunoruwatadax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+pdf+rotate+and+savePDF 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_off0000d536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD536 10496 bytes
SHA-256: b425f1c74960eeebf5ba90f9025db5d0859df304071ac1a06ca941fd67444761
font_01_sfnt_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 18376 bytes
SHA-256: ad9c11046e14179c60f8ef965e195c974fcc29a6716fa8e95ed54ee5d7bf391f
font_02_sfnt_off00011ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1