Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7e0ff620c504f9…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 09:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 003b281a23626db3d600e370e7d5de1b SHA-1: eef7fae57eb08a4aa391079b6cbe60a66ce5ce51 SHA-256: 3c7e0ff620c504f93822f7c70f6f79f7fd5d1f42adf19d8c1ddb8b4ff20008cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and employing UTM parameters, suggests a link farm designed to redirect users to potentially malicious content, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://ketchas.ru/uplcv?utm_term=counter+strike+mod+apk+download PDF link annotation
    • http://flairpens.ru/uploads/file/70417626167.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/46480774529.pdfIn PDF document text
    • http://poorclarescork.ie/images/81316884636.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/23516919750.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/fetominedevebusi.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/julelakajarab.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/juxupunixufitut.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/tolugevowijewijaligesaze.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/4fa8a3c608817596b114dd640f736c88/10661008520.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d95b63cb59---masutavasilaxapurokun.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/24507892435.pdfIn PDF document text
    • http://health-bridge.in/upload/file/69819103652.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/mivasoleg.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/4010726067.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/77423957545.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/81894891234.pdfIn PDF document text
    • https://hojoairport.com/images/file/83608286825.pdfIn PDF document text
    • https://masukpt1.com/contents/files/40092850194.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/mezaw.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/69324475640.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/46867342125.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/fawoxugibepeno.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/70434440421.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/39083433012.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/85076977319.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/59919401936.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210909022429_kmb47u.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/saguzosoniwevasebodowojef.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_off0000d322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD322 17496 bytes
SHA-256: 3cdc5b0d37d8f7a6c75dbf6b06ea2a0cd9754b7ce3dcfe7d1be7c2b1392c274f
font_01_sfnt_off00010051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10051 10864 bytes
SHA-256: 0d8d41d95afdc6efbc1383ed05e4bc162ce079ffdd7d5e66b0ad9e2c904e859d
font_02_sfnt_off00011985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1