Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c02d0362e63879…

MALICIOUS

PDF

85.4 KB Created: 2021-09-17 10:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b9c14cde2802d30756b487659513517f SHA-1: ff9106d2e21227dafe14439b9c40be67659fb5c1 SHA-256: 15c02d0362e638799ad3825d707298550c0fdb13280dccf9472a90135f9eb05c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to external sites, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://drafthe.ru/uplcv?utm_term=android+apps+javascript PDF link annotation
    • https://traffictkt.com/viking1/uploads/files/9318886446.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/add120e4bb91091209cc2567934e5719/99658492977.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/kazidanut.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/wofutipibizit.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/bemodiseveg.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/dufipi.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/97939807583.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/46111185322.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/nowag.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/51107429795.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f649e6f23---41448983611.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/24508563034.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/36585048165.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/lasisazuma.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/zafoxomuputi.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/12740456840.pdfIn PDF document text
    • https://successalpha.team/upload/files/lamikotufinapokewuz.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/sowizosuwitufovurig.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/werekojazuburisimemerave.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/vakipizijajirokidif.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/33800530666.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630767224_1.pdfIn PDF document text
    • http://domuran.pl/files/file/poxegoxe.pdfIn PDF document text
    • https://hoongnau.com/upload/files/86608278113.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/nolatigifelovitibafipetut.pdfIn PDF document text
    • 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_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 18140 bytes
SHA-256: 112a70b889c697fa40794fbace797df52e4fea65558bfe23347148f21ee426c3
font_02_sfnt_off00012ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF5 10504 bytes
SHA-256: d9c9820e48582bf306eb077c8235480991d65e5e3ac896eea7599f4d89ce46c3