Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23fdc2afd28a993…

MALICIOUS

PDF

74.9 KB Created: 2021-09-21 12:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8ca2f6d915ee610cd11b45b9d0241919 SHA-1: 2d2c220548abc4d8add76c6ff2ad831d8972457c SHA-256: e23fdc2afd28a993c3755446932e556379735db4f6e388c95e01ef4d4d3ba4aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to phishing or malware download sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious destination by using a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f9b33bb071dbf7fb544312edbe33e22b/13011477982.pdf In PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219122314245257.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/79867262207.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/vubexebe.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/48586670453.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/62171367048.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/60131953985.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/pidirewipiginu.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109031215027514.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/49949693882.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/lunipetoguboso.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lelalewap.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210912150307.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/radovitazeluwuda.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/jozagi.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/mebafojimaxuruwerir.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912c1da24e---doziletufazofaveg.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/37094304942.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/38640256700.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/69343883364.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/xisikimodibuv.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/fulaxokevokalomajodidi.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/80569383812.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/radujubib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=adjective+worksheet+for+class+6+pdfPDF 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_off0000bebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBB 11136 bytes
SHA-256: 8937ec43e3cfe4526c97b0efae920c74b775cabea27f68614b31d6f58d6ac591
font_01_sfnt_off0000d8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 17652 bytes
SHA-256: 615e2e496d0697c5c71525d23d96edccd38a5d55332cfa90922d7e1026852792