Malicious PDF — malware analysis report

Static analysis result for SHA-256 c411cd46107bf51d…

MALICIOUS

PDF

75.1 KB Created: 2021-09-20 19:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 214773892a8c0299683e5099ffad4dd9 SHA-1: 04d91b51c73d1c942100fd66f3fe3b19465e29d3 SHA-256: c411cd46107bf51daebc47522d269c8aba37a9c1560d18de1e90f544375d63fb
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 disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, and the ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external links, which are characteristic of phishing or scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8530

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 http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376a208a36f---pabatutixizezowori.pdf In PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/xagowewuzirijapu.pdfIn PDF document text
    • http://sungder.com/upload/98721275839.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614656edd62f7---bixazebefefozejomogas.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/vukakenaxipudubov.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/fafegaxomagawuzug.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/didusodomofelogo.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/68188106341.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/budigarono.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/luvulij.pdfIn PDF document text
    • http://hmed.vn/upload/files/dojasizusuguxuwap.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/33352130871.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/napegutikalefuv.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/vudojirapexubagemopelusip.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210904120658.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/mebesijekenodaluboro.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/48389230560.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/tutivapozuparezozida.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/juwupajozi.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/rodopaw.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/dulebajalalumelubegopu.pdfIn PDF document text
    • http://adriennemason.com/assets/files/zevadipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+access+otg+in+androidPDF 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_off0000d987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD987 10576 bytes
SHA-256: 11c815a31a2f090ce5f4c42aa7174c2f3ea65a13b39cf5c12505e1275bec7461
font_01_sfnt_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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