Malicious PDF — malware analysis report

Static analysis result for SHA-256 c686604afda5c368…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 03:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ef279a1c7a0f02d78ed7e0d723de64d SHA-1: ea9cf61ef7b5f63635181b42ac3e9465ed29ef78 SHA-256: c686604afda5c36800e68f0a8116b78c98fdb381ec48067c12dd2c998015dd52
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=in+box+icloud+remover PDF link annotation
    • https://izr.fr/files/pevawedumiboxagav.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/xufanixo.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/zubekiretototulaz.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/47982608443.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/tafisolotesonesuf.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/geguveduwubazip.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/46298462917.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/tawipawebuviwuto.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/wididetiturawozegozefu.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091800541936.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/wabefoziveseg.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/9013201973.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/11408945430.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/nuvamunefedanenoruwonumid.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c9ac9dad4---pajusezeboxujotujubopo.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/datibisadu.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/69330928623.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/kuvebubunuba.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/sozukuxiluvaxekadug.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/88157163655.pdfIn PDF document text
    • http://artio.pl/files/files/nikugowew.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/kazaxi.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/puwavikini.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/vowup.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_off0000b1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EB 10464 bytes
SHA-256: fe4656efe9de2ad851df7ed65c5f0db87298c59db1963f09682f4b1fe9f14aa5
font_01_sfnt_off0000c99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B0 15132 bytes
SHA-256: 7134596c60ce67bbda37dcbc69299753d5ef0f0f6c01c4fec88d05cd39c8fd5c

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