Malicious PDF — malware analysis report

Static analysis result for SHA-256 63171fb123a73dee…

MALICIOUS

PDF

62.6 KB Created: 2021-09-24 06:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1048408289bd191daba4402ca8bf4835 SHA-1: d820421ab4aed2730b1d4014128df4a66caa2995 SHA-256: 63171fb123a73dee6971148468e5a6e0bae1ea8534f3b265c1e2e0d179e35c58
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7558

Heuristics 4

  • 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
  • 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://giaiphapthietke.vn/media/file/files/fazuzusano.pdf In PDF document text
    • http://nexxstep.nl/userfiles/file/gafepebabusolamusagerel.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109021131252120.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/90610623048.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210908/files/20210908115458.pdfIn PDF document text
    • https://lazerom.pro/media/file/10743935408.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/bozovujopamo.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/86316862790.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/10759070505.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/63170596423.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/47410966107.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/33624152083.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/73873448916.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/20183124117.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/disezuki.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109120301097831.pdfIn PDF document text
    • http://fruitsad.pl/images/file/lanozimumupuge.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/19386682010.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/42812960315.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/23609924077.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/puxukuxilususemusox.pdfIn PDF document text
    • http://www.perlodrink.com/documents/moveruzawetu.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/72996902902.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/rinipelafinaj.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/dawizopodezajad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=tv+launcher+2PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A4 10096 bytes
SHA-256: 539282038032cfd8b97770d4946f8f2faea8a10d61d7b75240180f3c7a052cb6

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