Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea483df52504e755…

MALICIOUS

PDF

84.4 KB Created: 2021-09-11 07:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad5ce3c44fa2fe781d1aae14810373d0 SHA-1: 8bc6f5e04e3fb6e2cb1724b9755baed8f2e7399d SHA-256: ea483df52504e755fd5e454a6892d0b1db7b6aba5f4b6b6cdfbd472ba575544f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to disguise malicious links. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's designed to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://whereestar.com/marinarubicon/admin/file/10769748490.pdf In PDF document text
    • http://ulv-fogger.es/d/files/16766688900.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631082731.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/wifoxofesinufubugowijiz.pdfIn PDF document text
    • http://bdn10.cz/files/file/rovaxinoropasuki.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210901053251.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/kuwusupafo.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5e969325b---mafavezebiner.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/97166935498.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/vakexarigikiregu.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/97842023600.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/muvuzir.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/56464573481.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613236a6e11ad.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/maxofogumukuzekogozijig.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/navomuxudazefabaf.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109111155538925.pdfIn PDF document text
    • http://hjhchem.com/upload/files/9063673398.pdfIn PDF document text
    • http://cwesp.biz/upload/file/80948305824.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/kepekanidisepug.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/sunuzusakemaf.pdfIn PDF document text
    • https://harom.ro/files/file/91974808604.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/46402586237.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/72479158581.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612edfa8930a4---gepofubikuzinekexevodiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=transfer+photos+wirelessly+from+android+to+pcPDF 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_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 11048 bytes
SHA-256: 5046f68cc8f199deedb1c52792ef15a239a0864a9fc38d1c44de9a82dcaf570c
font_01_sfnt_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 19000 bytes
SHA-256: 6d22d88320fc15030a9449e1057058cd3647cdaebd11d2469b78e8a9ae703cfd
font_02_sfnt_off00012b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1