Malicious PDF — malware analysis report

Static analysis result for SHA-256 343858dcc90c05e0…

MALICIOUS

PDF

76.6 KB Created: 2021-09-14 13:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f40d9776734bf03d3699776d27a430ca SHA-1: 70db28a8136b1647cd3289488e58597bee0f2865 SHA-256: 343858dcc90c05e0070a20dd5fedea34a481151b4d20ef68aeb043c21f55ce3b
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests a social engineering tactic to trick the user into installing malicious software or revealing credentials. The embedded JavaScript likely facilitates the execution of further malicious actions, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://hotel-ambassador-nice.com/upload/files/gipapagesomokosuve.pdf In PDF document text
    • https://presentkompaniet.com/img/content/file/19329734915.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/relevoxelefiwotogu.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/tapebit.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/40643399198.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/51711923487.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/dopizojusagemi.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/dafud.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c634613c2---mafetid.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/98457983826.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/24496620651.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/ratawofaxumo.pdfIn PDF document text
    • https://flyags.com/editorResources/file///76950373295.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/jemonumasuv.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/zebotef.pdfIn PDF document text
    • http://punaide.com/userfiles/files/tolamisubuvi.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/55174630146.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/82967552513.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/50158850499.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/51260379534.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/16422536618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=dragon+mania+legend+apk+modPDF 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_off0000bff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF6 20116 bytes
SHA-256: 5f4978da186b178ef11baf29086876027cb13ada24b888cb7adf7cd4245a90b2
font_01_sfnt_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDC 10560 bytes
SHA-256: e5133d6e98ac8f94e01e033f69023c0d4257ac494d18db30fda35a007387e23e