Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4ccdf1aaecf1d5…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 10:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 63894c84a12fa9b51cea6d013f1faa81 SHA-1: 9e54bc8a2c87bb41ec9d54a43e0c67fc8a86b7d1 SHA-256: cf4ccdf1aaecf1d5d7c567af76202296313cb97c82d337b94a33586ecb3bd5a2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6208

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://laborke.ru/uplcv?utm_term=vidmate+latest+apk+download+2020 PDF link annotation
    • https://cardion.dk/gfx/fckimages/file/74615271542.pdfIn PDF document text
    • http://shahgrp.com/uploads/rumisuxuzifoze.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/23660280352.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/mikojikabefigasuroxanixa.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/39711470322.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/8642134638.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/69361326037.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/6327235551.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/wefijawarepufogosolu.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/bonufadixagavoletigese.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/xazizojusudunosapexevez.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/zugimub.pdfIn PDF document text
    • https://ptogel2.com/contents/files/9479769643.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/8725208359.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/rikovibokuxuwev.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109011558528366.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/523285252.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/62554138115.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/92466830985.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/zifinipapaze.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/40534727911.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/43174685536.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/poluj.pdfIn 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_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 18172 bytes
SHA-256: 780b4895ce3aa7bd359db1f990bd66ad5b3f528f167b5c23f538e87d1a997aa2
font_01_sfnt_off00010b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001232d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232D 10844 bytes
SHA-256: 2fce469a27c8c75cc2a09144b32f45a464cec0e826818edcdde67cef580b6764

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