Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c55f6d2f709104…

MALICIOUS

PDF

63.7 KB Created: 2021-10-11 21:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9ed80850cddfe5d33f449919931bbdd9 SHA-1: 2ef4183a11f97a0fbefda26cea5a2a1cd4835678 SHA-256: d5c55f6d2f709104111ac90390334da5c47e6a5d2780cab9f38ee5dde793451e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6968

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://coebmsf.com/userfiles/file/11596123889.pdf In PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/52632880042.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/52709044254.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/24147726281.pdfIn PDF document text
    • https://cartolmania.it/file/64997135022.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/zuxefedomitizupewajazaras.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/ruwifuve.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/27047516150.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/69234219059.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/46676612181.pdfIn PDF document text
    • http://na3.it/misc/file/76208381815.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/62396139782.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/93620310997.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/nofenarebesokene.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/mubupu.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/40188032630.pdfIn PDF document text
    • https://redfortfireworks.com/ckfinder/userfiles/files/tisadavesikorewowo.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/38971019295.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/15917398315.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/lekabagonedo.pdfIn PDF document text
    • http://maihome.hu/admin1/file/51299793350.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/ronoliduxedefepig.pdfIn PDF document text
    • https://shaksheer.com/app/webroot/upload/files/69444546751.pdfIn PDF document text
    • https://777mto.net/contents/files/kepapunozoto.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/6022395892.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HTGXzuRVGb4/uplcv?utm_term=pdf+to+swf+converter+softwarePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96F 10484 bytes
SHA-256: 039e4248b4a8e83e60e0215d7be885497295000b45a034bc83adb80356671697