Malicious PDF — malware analysis report

Static analysis result for SHA-256 acecec1621fc79bf…

MALICIOUS

PDF

61.5 KB Created: 2021-09-28 06:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 80eab99987eb87fcf6c21249b351d799 SHA-1: 3ca57115be070eb2f8a9e32b2ab5bfff467bcf39 SHA-256: acecec1621fc79bf927da2f9fda5fde0881d189ecf32fff69b68737119c74613
140 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF viewers and delivering malicious content. Heuristics indicate it functions as a link farm on disposable hosting, directing users to external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5578

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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=work+it+full+movie+watch+online+free PDF link annotation
    • https://mavachhaiphong.com/upload/files/85497436522.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/53611710638.pdfIn PDF document text
    • https://fuoriscena.eu/file/tugenuvidexazofibug.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/tanujosirividawepazuvepiw.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/repudogararepetagax.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/86771321364.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/weraxetepawufaba.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/luzajibulezerafogimijigor.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/powedomadejokuvazoke.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/finoruwadituvewure.pdfIn PDF document text
    • https://synersys.fr/contenu/file/15696862974.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/wigelaz.pdfIn PDF document text
    • https://unitjaya.com/contents/files/nomabemej.pdfIn PDF document text
    • http://esen.life/userfiles/file/sabumitizinekodawakojajep.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/i04jkht0ps47ucok3e8ck28bk6/93168002791.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/pekolewajimanomeduzogen.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/40136963746.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/xinavewuledud.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/5963176318.pdfIn PDF document text
    • http://llux.vn/uploads/files/59779501741.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/64383748793.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/49419847403.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388e6f24187---33276411454.pdfIn PDF document text
    • 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_off0000b0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C0 14496 bytes
SHA-256: 25cb2714e393a9c29951e90758e80a9f61a98e5a346cc3f35e5f994d5b6aca79

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