Malicious PDF — malware analysis report

Static analysis result for SHA-256 755e56e8cf4a5b22…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 09:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d7f2d83cf209678e5761f5371bb78eb SHA-1: 4c7f0e320750dac58353a652ba7b0d155cc4fe25 SHA-256: 755e56e8cf4a5b2272975e9ceda15b6af08c316e45699780c295531bbdda7419
124 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated maliciousness. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The primary purpose appears to be directing users to a network of links, likely to facilitate phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6702

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 http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb2b47b57a---11352350816.pdf In PDF document text
    • http://way-of-spirit.ru/upload/file/57735215277.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/durig.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/wovofipoki.pdfIn PDF document text
    • https://razredna-nastava.net/files/wemuw.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/22766665254.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/lugid.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/taxokenutarivewadudus.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/kuvofewuxudinera.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/92889790726.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/28308709741.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/tapikurewo.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/89351017073.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/lokatizatawa.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/72216033238.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/vakalajexid.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kce3cis0jksrihaodd2kaok9h7/10681450066.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/mobelujofavimuro.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/13075082805.pdfIn PDF document text
    • http://signauction.net/userfiles/file/remajow.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/22856117667.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/25692720798.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/kofenotugajuriledasedor.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/fabikumafuvipev.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/zidilopet.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/limulaxuvoruse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=top+game+nh%E1%BA%B9+m%C3%A0+hay+cho+androidPDF link annotation
    • 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_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 16552 bytes
SHA-256: 1882affa4f03e64d76fb3ed286adb30cc262c6682f01bc45eda1c128dc64d637
font_01_sfnt_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EE 11092 bytes
SHA-256: ad79e0d5835e44a431410fca28d8970018444a989cd27deb2d12960ff27b5bd6

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