Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa89c6087217956b…

MALICIOUS

PDF

60.6 KB Created: 2021-09-28 19:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 08fe2a57924ac1856af03a0f185860e2 SHA-1: 511990e513eef8b3d64b2aeff68822294c34f5a5 SHA-256: aa89c6087217956b1dd69e5455c09f904ce18f1ad472f94fcb5610407d4ef873
132 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and multiple external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely a phishing lure for Discord Nitro.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5578

Heuristics 5

  • 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.
  • 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://trsoftyazilim.com/genelresimler/file/65513991053.pdf In PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/12863764184.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/93f47e1bc5f0bc9f75d98c2f1fbb2b6a/91180642775.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/zedegigikebivo.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/denawete.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210906_091816.pdfIn PDF document text
    • http://thietbivesinhsonhoa.com/webroot/img/files/72826392989.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/20861369195.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/musutipoginuv.pdfIn PDF document text
    • https://ms01bet.com/contents/files/pubem.pdfIn PDF document text
    • https://euchebnici.com/img/file/xazevamenunanapavemomij.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/disufef.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///tufabibep.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/77869682291.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161527946ad8ab---45505474672.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/ratifesakikekikelinidu.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/palajajatatejogagalekexu.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/zuwenosep.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/50430963395.pdfIn PDF document text
    • http://chemicalengineers.ie/images/11586054006.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/luwomudab.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/suzafofesigelozil.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/zuvetawejag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=discord+nitro+key+freePDF 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_off0000b7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC1 10468 bytes
SHA-256: ca001f7fe0614da311f3e37e09f9e81c38d54e2ab3a224e3be2eb03905368337

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