Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff91a9d1c40b7cbd…

MALICIOUS

PDF

67.1 KB Created: 2021-09-18 16:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e373cb7836667bfb1d33a8f548f637c6 SHA-1: 5b8d6c34e5d65bb3cc9f5f824720d8070890eeaa SHA-256: ff91a9d1c40b7cbd5470c9c848dbf6ccaefcb1b8fcb0a8d756137d7546da3b70
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of distinct, potentially disposable hosts used for redirection. No scripts were extracted from this sample, but the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8166

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 http://vanlysecurity.vn/vanly/album/files/nojowovurim.pdf In PDF document text
    • http://stroytehcentr.ru/images/file/57427461328.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-3/20210903145511743464.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/26364834556.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/medufinedobo.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/70294880329.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613329c1b33ba---jinozanava.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/risirebowuniwazexupolifig.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/gunoxiwawadiwaruw.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42304955616.pdfIn PDF document text
    • https://grandegroup.net/files/26523161932.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/35399998582.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/195365859.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/dekewikojazenujepow.pdfIn PDF document text
    • http://pi-consulting.ch/download/53724465010.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/dalerazuwi.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/24740321176.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360751346ee---63136019354.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/papurabiboxolatuziwatuz.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/kotebuzezojomaregur.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/duwapulomiwil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=stop+ads+popping+up+on+androidPDF 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_off0000e23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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