Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56a5be139e23587…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 08:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f54882acb9d5780cd54289bcda2a37fc SHA-1: 0137f54a8ae7e85178c272ec61610cac2f681b57 SHA-256: b56a5be139e23587185a31c1e4f175216ac66a8ab4ceedd19b9994cab1a8ba58
166 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick the user into installing malicious software by impersonating a necessary update or extension. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • 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://96rangjai.com/userfiles/file/xulotigajomomofepuz.pdf In PDF document text
    • http://luxe-pools.fr/i/File/puwevekuxilovopeg.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/97002344907.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/70338017797.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/45594441187.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/13311293144.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/kusizemekaget.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/42843423397.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/28314069963.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/7160200846.pdfIn PDF document text
    • http://clipsttm.com/userfiles/file///xasorevudafe.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/65431117222.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/bebaxowizifelunu.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/pajitavegupidomasegeb.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/94050841827.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/nedapogelajaf.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134aea73be62---5840792117.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/nuzirobafaxonajusitilel.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/zuzisiwamikumajowum.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/fibidununazazotixutovil.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/ponirelolimazotivoko.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/11659428860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=video+downloader+chrome+extension+androidPDF 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_off0000adb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB1 15364 bytes
SHA-256: 2deae5d28143f586c2c4eeb346333a08b871803748c054a6a1d3a8338aa59fdb
font_01_sfnt_off0000d4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED00 10792 bytes
SHA-256: dce67ef8d8874ed318e1229a904e0a284284ba8c53ef3a096f98e7387921cf69