Malicious PDF — malware analysis report

Static analysis result for SHA-256 e311bc452aecfc52…

MALICIOUS

PDF

71.1 KB Created: 2021-09-18 20:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f8658967e081a786e30973d7f0deb596 SHA-1: 19c85acfd2563ae63fe952a1c3bfeed8d94bc1af SHA-256: e311bc452aecfc52642ffaf4c6897575fea2b1d04f6e31cc1420fa41ffb3902d
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and external URIs, indicating it is designed to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a large number of links pointing to disposable hosting, reinforcing the phishing or malware distribution intent. The ML classifier and ClamAV detection strongly indicate malicious behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7723

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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=logic+and+computer+design+fundamentals+5th+edition+solutions PDF link annotation
    • https://tktravelkorea.com/FileData/ckfinder/files/20210909_7B22ED429F2F9E0A.pdfIn PDF document text
    • https://renault-service.com/userfiles/levekemaf.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/59707697105.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/75356765886.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137e07a6a6ec---7077181943.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/seritefukat.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/sogolevi.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/fozav.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/79047626626.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/pawazarabujazomigenoferu.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/58628700973.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/tiwisuxixumugusujoxez.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/9391017310.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/71473372294.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/75560310567.pdfIn PDF document text
    • http://dytac.hk/userfiles/vapetajigafa.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/42913473484.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/gagegofizobojevezotuvi.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/53416286250.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/lonakadumobimasag.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/zirujekevav.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109071026198103.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/wivisipa.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e32a3adf97---19376274277.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/50554542126.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_off0000efd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 19604 bytes
SHA-256: 32d2ceb2c76bc69843cd829b68a1254da059795cbb53cf26b6d54dd4dbe281a1

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