Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa40879ff4906f7…

MALICIOUS

PDF

72.9 KB Created: 2021-09-13 09:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9b7247bd4405f84985bb9cbb828ce3cd SHA-1: cdcbdb9b1b2dc86d1ce471331f624d2ab2fc2704 SHA-256: 8fa40879ff4906f70006d0f0b22fc3d3b9d90d9639fee300e1493803d6e91177
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aiswaryamatrimonials.com/fck_uploads/file/lolabe.pdf In PDF document text
    • http://ddgasul.com/userfiles/file/61172597006.pdfIn PDF document text
    • https://led7.ru/file/27569725361.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/wakusozavotoronopu.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/83651562383.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tudasanidojunoneke.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/0d6ca62c337621179a7103daca9b4b52/32007635861.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/36281802074.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd7643ba9f---94485383258.pdfIn PDF document text
    • http://risme.vn/files/xupuzutesowomiz.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/kijosiwimewukujotimavagoj.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/xapudenufexusukos.pdfIn PDF document text
    • https://coevent.ru/upload/files/medibutuzotutavurijidajut.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/53953460872.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/47629368807.pdfIn PDF document text
    • http://all-premium.com/user_file/files/47938459755.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/gobimukefotikupedawapij.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/73005942979.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/bularadoromijujenexigan.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/lunilimadizuwunibisut.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/17325603843.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/44659900148.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/12046634567.pdfIn PDF document text
    • http://kisito.com/userfiles/file/36297593819.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/94846079040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=math+ia+topics+medicinePDF 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_off0000bb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB86 16400 bytes
SHA-256: 71c0fdd3dae93778b122e95bd39e99b56c8f67ae70571054b8a331fa8518f627
font_01_sfnt_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 10624 bytes
SHA-256: 871174bcae4a4f7a3590e5a56c4e49740ffaa3edd15d5e718b898ba0b00556f0
font_02_sfnt_off0000fdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1