Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5afb0ccb39de3b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 14:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1708c8ede22fd8a914346184ab603956 SHA-1: 6093a69eece8fc04703b46754d98fdfab8489721 SHA-256: eb5afb0ccb39de3bb58887cf9bbb6993e2617535f5092f806a3f6effa006a8b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving directing users to malicious external sites, likely as a first stage of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=contract+killer+2+android+apk PDF link annotation
    • http://beautifulmoda.com/userfiles/files/36921033198.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/34527703600.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/96656272150.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/nakepoxojobidenezax.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/pamomigobubefodeken.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/1709167329.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/suxosagirokanisutut.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/20334183521.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/rigifubuga.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/75148036210.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/16275271600.pdfIn PDF document text
    • http://ossokahve.com/upload/file/69979338785.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/lifupuzowapuxeralusito.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/gopolajazenejo.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109030452072134.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/63756329021.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/86597296532.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161400f2ac3c68---lifasezi.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/15107745854.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/tesevivurivedunidu.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/83515280371.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a32ce15bb4---30944876014.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091406262053.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_off0000d64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 10584 bytes
SHA-256: 4529cd0cad272b7fa4fb11c8bfc227aa556162cf89b296af2b56c663b4e93212
font_01_sfnt_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 18172 bytes
SHA-256: 439040ee90e6dd07cf2981ca91bab3ac5ae0a39092a3e5384011e5319960943c
font_02_sfnt_off00011d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1