Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a3d7312cc9ccfb…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 06:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd33cd78010706bd08efe518184cf623 SHA-1: 2760e33838ca74c7cd328ca41eddc9ddfbbe9187 SHA-256: 10a3d7312cc9ccfbd044dc15053cd02143173fc0cea52196b182ffabcc50704c
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The ML classifier also flagged the PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lead users to malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8394

Heuristics 3

  • 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
  • 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://infrive.ru/uplcv?utm_term=traffic+rider+game+download PDF link annotation
    • http://levotst.com/uploads/files/ropisilil.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/mawonofosewewelu.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/31489128711.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/bofafuturugolasopun.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/dokulaxugofetedojivi.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/48146138176.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/65604728231.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/71218889380.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/pikozeda.pdfIn PDF document text
    • https://harmony.im/userfiles/file/5931201625.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/tanomeru.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/56271247200.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/40015348840.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210915152545512234.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/40754470723.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/muxisofakajinoxu.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/voboredaw.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2qbieapqleg8su64q5abv95te2/wujeviluxame.pdfIn PDF document text
    • http://besteva.com/upload/files/tenagipogir.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/36963441492.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320bf27a988---5179362515.pdfIn 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_off0000d509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 10604 bytes
SHA-256: 58b79ce0cbd13648768035ad312575e0e8757f4bd1626c272b5573c4824934b7
font_01_sfnt_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 23484 bytes
SHA-256: ff05e8f3e46f80ec6a2631fc3d95ca8b1bdff2ff840eaccf709fff994b435ff4

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