Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3576e85bfe876ac…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 19:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c317ed9c91fb1af68e17c1df6738b312 SHA-1: 66fc85af712cfa3ea0ce89a5aac4f7ea5725d53e SHA-256: b3576e85bfe876ac3bc4c34c815a600ba79c20812093ee0fd424bff9f42d2ff6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to redirect users to malicious websites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://interel-rus.ru/test/sites/default/files/file/4830914293.pdf In PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/14945395096.pdfIn PDF document text
    • http://soc-in.com/data/media/files/31824679250.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/71662339883.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/ruwowesinusozipepug.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/durumajunidikidibuvu.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/37443983146.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/fodabegodofotosapivun.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/7edc6171600c67ae4accc4516488b100/pelarusitimosi.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161307a80b5e51---34813635385.pdfIn PDF document text
    • http://pedraferro.com/files/files/sapanavabinunenut.pdfIn PDF document text
    • http://wych123.com/upload/files/95870194413.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/jozadudoxirusebopuzafipon.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/38173716098.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/fimubavemode.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/piwalogabusir.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/bupevizuvopevejivegojasiw.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/welesufiw.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/45386394023.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/76212591509.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/75385115444.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/nuxixapafulududorumazopo.pdfIn PDF document text
    • http://vucert.vn/uploads/files/99290297621.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/88086687318.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/16116263704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=download+imvu+for+androidPDF 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_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 10368 bytes
SHA-256: 07946912949d9a30be423ad811a9f6284dc46f8bb5b432f7adda3bb24b0b0b2a
font_01_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 17004 bytes
SHA-256: e9dc33619c6edc5e5a952fb9890a768cbe4f6ac1abe7528fa917ea4019278e07
font_02_sfnt_off000121bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1