Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd09902211d4c71…

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 05:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9b101572f0819972800e1e926764c148 SHA-1: ad7a5255ca9bf3400b3024c62552de96b736e56d SHA-256: cbd09902211d4c71f89573030f11554d3c386bc4c9e0e32c92c29c9fb61af1df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content or phish users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high volume of links on potentially disposable hosting, reinforcing the spam/phishing nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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
  • 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://jhservice.net/imagenes/galeria/files/sefemeteb.pdf In PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/44366304633.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/58171726794.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/12763973465.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/14094022483.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/94065514563.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/budavazugokod.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/rijusuzunojedabexigivifam.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/kitalemer.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/32105017217.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/kivegezumiguwotigixinetaj.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/pamepapuzov.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/govobadojupesoleduxelagal.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/tupenetaxi.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/a0r16vdsr0jbdbppnbn716ve21/sasubopikukajolevogobosat.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/66604027616.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/supogufe.pdfIn PDF document text
    • http://synphabase.ch/upload/file/46984255425.pdfIn PDF document text
    • http://gaudi.tw/upload/file/68514834230.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/12125919875.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/22466922491.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/wotimokuzuzisekixib.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/46506962576.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/lefofezola.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/sotulunas.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/zupidurupavub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=splitcloud+double+musicPDF link annotation
    • 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_off0000d571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD571 20064 bytes
SHA-256: ff330a2a5d9356682b9680e6b21a40cfb20f57638623a33df1f8f72285e4a624
font_01_sfnt_off000109a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BF 10624 bytes
SHA-256: 787f4d83a7f2200d2c81cb92d3863b60266c5eca374fae833d72455a35365056