Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1673d279ab089e…

MALICIOUS

PDF

75.2 KB Created: 2021-09-28 05:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 664a17c8f70200d2486664ff423f9f14 SHA-1: 0c3bb4b89d7ba14e4f873d983c76ae6f4145ba6d SHA-256: 5f1673d279ab089ecbea98c83fbb3c30816d01f4c222cff8c6f1a0d58686f1ca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links, likely for phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript likely responsible for the payload delivery or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d920cc9bea---bibuponerifo.pdf In PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/32168341995.pdfIn PDF document text
    • https://red-adlay.com/upload/files/rezodifugapifetebamesebuf.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/torefizalizonelonitidawa.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/64912787217.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/69843857068.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/soxemadupakok.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/tusoludalejer.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/valodijurekipomibaza.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/zogerojosu.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/sejirozawimijulofit.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161471a207b015---zuwotubamitafuzubab.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/gapusiwukixujofiwosebat.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/lolawom.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/vepofomufigokegatelogeja.pdfIn PDF document text
    • http://synfarm.com/upload/files/34244271778.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vomor.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/mewemovegumirevimipalut.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/luvif.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/98688493180.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/vezapareziwotugami.pdfIn PDF document text
    • http://hodori247.com/uploads/files/vunorojubikojafedod.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/zuwumoma.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/pozarunufizababilat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=best+phone+under+25k+in+bdPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC12 19056 bytes
SHA-256: f566ed8f0f71d3df12ee0affefa13d64450c82fa9924fcd1aad7b0efc885b382
font_01_sfnt_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 10920 bytes
SHA-256: ae1a9716d5564cc202f3f8087ab8ddc409a0e9937cfe07054d236a59e10fc2cb
font_02_sfnt_off0001071b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1