Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8e3a077445018f…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 06:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4bdb594757bdf3f2d0fd9357bb44069a SHA-1: ae090eb79f8575e218310f6d111f376e0411f8d7 SHA-256: ee8e3a077445018fab8f408b6fed0489630443301355e9492aca9a6c6cd195c7
134 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 suspicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of this document being part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://tubemakingmachine.com/uploadfile/files/lamokuvir.pdf In PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/38707427512.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/litipumit.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/dafulikinig.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/3781618579.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/rerotulitakive.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/wifiwuviri.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/83859817665.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/96215871271.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/vanekafupuvejulifixipiren.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/20701422142.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/62cbaf54f39ba32d76eb38721f92501e/89687566906.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/23768727970.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/povuwonokol.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/tekopupodazixasofil.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/jixisa.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/dipitusabivixejebewor.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b2691ef40---87700956733.pdfIn PDF document text
    • http://mariancozma.com/_user/file/kozibadoretoworu.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/mokidaw.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/72138464798.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210910_110122.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/79647344322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+silent+wife+karin+slaughter+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 10896 bytes
SHA-256: d86629011e7d0d6f85c353c0b68c4ca8bd27fbf81be8572de1c65fa2e6391b46
font_02_sfnt_off00011e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9E 17632 bytes
SHA-256: d405b801cff4b8855b04a4e0f579524b49eead990c994a396da8d490e3e8f0f1

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