Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cb30fe7ad5258b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-20 10:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f09f296a8b927ba0fcd6a9e1a419d32 SHA-1: 7390bf5e474d44ffcc59dc0d4f6f0bf9674f60b9 SHA-256: 98cb30fe7ad5258b676f81ad13cb560b1858f5eed13d9eca424e48e093953afc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code within the PDF viewer.

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 https://pistant.ru/uplcv?utm_term=resident+evil+game+download+for+android+mobile PDF link annotation
    • https://madame-tina.com/ckfinder/userfiles/files/10895539668.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/74143291942.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/lukanemutojapis.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/70640937788.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/vavapewutimu.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/8158501529.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/64172511433.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210907_101545_182.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/64572197730.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/85265094674.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/14133174829.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/jixoxizevavip.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/kezitemixakubexamewemuk.pdfIn PDF document text
    • https://salwangurugram.com/files/33116926195.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210919162459.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/77883498373.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///35033077822.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614390e0b2fa7---36262992545.pdfIn PDF document text
    • https://russiancosta.ru/ckfinder/userfiles/files/tojijebadi.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/71044441331.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614037a3c34ca---64367033928.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/kolugitetapekixixo.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/17212847039.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/64042032494.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/82620565087.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_off0000b720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB720 16160 bytes
SHA-256: 65f4ad6b37517c5d6d3d1863598a5b978048125b45ec71bc70d14976f4e76375
font_01_sfnt_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 11032 bytes
SHA-256: 53666bba4a97f58f738fd9494d6a4a906716f7d2460c51217578c1a2d8822775
font_02_sfnt_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1