Malicious PDF — malware analysis report

Static analysis result for SHA-256 234b5eb71107e198…

MALICIOUS

PDF

52.6 KB Created: 2021-09-16 12:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95cf5c3fb16e79a5cf5c56ae5358c637 SHA-1: 834311c284b6bea531697285f129a27192dc1f26 SHA-256: 234b5eb71107e1982d3c867070d3c4006e231c8f5b9dc5620d1aff0441c67af6
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are redirected via UTM parameters, indicating a potential phishing or malicious redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to host many links on disposable domains. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document, likely used as a lure in a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8793

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://huntic.ru/uplcv?utm_term=smart+auto+refresh+chrome PDF link annotation
    • http://netcentricnj.com/ckfinder/userfiles/files/zikusifikudow.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/97552977215.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210904165435.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/18531004482.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/97706339073.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/pujixapojiziwavo.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/28232470462.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/51502010003.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/vijekigudutogalisuj.pdfIn PDF document text
    • http://ibb-online.ru/f/file/pukik.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/ketitugejod.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/keganogokosawatawofibaw.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/158997388.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/28633245273.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/kudusifarej.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/kevomowisope.pdfIn PDF document text
    • https://rippa.pt/files/file/gewefefava.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/dekexuriv.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/rebujewotemalejixilijodu.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/95933537730.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/62795906384.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/wubadaje.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/57533767553.pdfIn PDF document text