Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd92bfb542dcbc23…

MALICIOUS

PDF

69.9 KB Created: 2021-09-20 02:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b2eb02c25bb707b9634c218eb8d6f673 SHA-1: fa9dd1bf284a6292f0b4e75d09f29ec67ca3cc78 SHA-256: cd92bfb542dcbc2392572a4ac43f57f88c8c3f596f104b040fb589d829f919f6
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF acts as a link farm, directing users to numerous distinct hosts, one of which is https://crewmak.ru/uplcv. This suggests the primary purpose is to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5042

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://crewmak.ru/uplcv?utm_term=hentai+sex+game+app PDF link annotation
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/75875200684.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/sefatupusidasuxodapemu.pdfIn PDF document text
    • https://argumentua.com/i/file/29928948606.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/85203992505.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/pexiwipujataxadomexup.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/84694647010.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/60898668989.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/15341168338.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/90494655991.pdfIn PDF document text
    • http://mamitobe.ru/files/file/90897755913.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/sujizupadufabigi.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/3447576687.pdfIn PDF document text
    • https://sardiniagreencoast.com/userfiles/file/50271868990.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/98139604922.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/71189092797.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021091315092573499.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/4804240029.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/12434746616.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/97365033251.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/lipunelotumuxuzeziloti.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161404a45020a8---xanotetajuvesodelu.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/7962842795.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/galupuzopoludefa.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/zejazodafusobok.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/xalikilapoxobozal.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/72574298069.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_off0000e6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C8 18540 bytes
SHA-256: ea19029a801c3f03359eea5bebee6349cd70ba5b36194a0adae05297fbb4d5ab

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