Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42120226c8e901a…

MALICIOUS

PDF

54.7 KB Created: 2021-09-16 17:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9efd9a8d652e910e4d2618e126341d43 SHA-1: e01ae50685cda3be7ec8d5ef92c6153b0d8c578c SHA-256: b42120226c8e901aacc3a82e833ad7e464ff262bfe74f019db1644168ef627dd
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. Heuristics indicate this is a link farm PDF on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious. The primary attack pattern involves luring users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8091

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://pistant.ru/uplcv?utm_term=introduction+to+the+design+and+analysis+of+algorithms+solutions PDF link annotation
    • https://zahrek.com/userfiles/file/pikusebugo.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365ddc1e575---89733015424.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/nofemunelizunujapabime.pdfIn PDF document text
    • http://hotechike.com/files/files/zovogaperozujuwa.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/dulumufodilemezexitefune.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/zegufewir.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/fapiredawojasovemut.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/1360943111.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/54531705376.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/diparabumaruxor.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/94370672222.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/94625111814.pdfIn PDF document text
    • http://klenderbio.com/upload/files/xesopuzujuzixiwiwiz.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zugirubetejakotukiramivir.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/21103041099.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/45628244029.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/pawerofin.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/46798749898.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/4282017112.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/22494635825.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161402191100de---denugufu.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/78777367463.pdfIn PDF document text
    • 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_off0000bef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF0 11088 bytes
SHA-256: 6a84495641a6a99f5434157b5f0c3dac77b5562cd55029fdca711ae88ed68539