Malicious PDF — malware analysis report

Static analysis result for SHA-256 217dbf13f8002a7d…

MALICIOUS

PDF

77.6 KB Created: 2021-10-07 07:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9159500ac17ca1bb418c31558c57742a SHA-1: 6bbcbd814c281f54ac81dda154b89b45b9530ae3 SHA-256: 217dbf13f8002a7d7024c6a15ff29784de3182610311b6e973421436fd530125
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on various domains. This structure suggests a link farm designed to redirect users to potentially malicious content, consistent with phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5190

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://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/wefuka.pdf In PDF document text
    • http://uforoi.com/app/webroot/uploads/files/zafufazanizebumenijomoda.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/2175427274.pdfIn PDF document text
    • https://webhosting4.net/media/file/komovojidipebufame.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/savuk.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/187df89e5c6c62233e44774c5a6b03e4/xizugomemabafisam.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/55640586700.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/77474855942.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/26716006815.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/60730302343.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/pixuvamoxamodumanipa.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/50525598954.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/jipudovakusovuv.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/11212709189.pdfIn PDF document text
    • http://goref.ru/files/file/pigawegirekamemofukikebax.pdfIn PDF document text
    • https://financenetwork1.treasuryandfinance.info/userfiles/file/tuwumajezogebax.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615564569a888---87293461003.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/78594589855.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/53152486416.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/majuwafilumowil.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/wuvuladenikufewedulewipop.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210906133721522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=red+white+and+blue+trifle+with+pound+cakePDF 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_off0000e27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27B 11012 bytes
SHA-256: 63e8c314f95eeec1055871357a99d8337884c23fcafb1022c01bf3c15191c8e0
font_01_sfnt_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 18864 bytes
SHA-256: e92a7178e9b7f018744f61c6ad9b9383c17a4c4fa2f28b3d615291320f5b8b83

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