Malicious PDF — malware analysis report

Static analysis result for SHA-256 80372550c6fb6118…

MALICIOUS

PDF

86.1 KB Created: 2021-09-16 21:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7980028f0a953f98322fe616d0f7376f SHA-1: 331f6f90d5b561916153443b37084e3ee38ea9bf SHA-256: 80372550c6fb61181e4e1417f85abfcefa50efba49afdc72edd0a4708271abc3
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including one on disposable hosting, strongly suggests it is designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed for SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=popular+games+for+android+phones PDF link annotation
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a6a9c5b5df29aeb706a6f816b03880c/90653498746.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/73505186872.pdfIn PDF document text
    • https://nistd.in/userfiles/file/22258411480.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/61135102272.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/gijebanolole.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/suromutilusetob.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210907180147.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/turesonobomowo.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/xuneta.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/16352077352.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/32933615568.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/zipukufopagalagov.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/duxakokuvefaroxujik.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/fipesajefakigejoriwufeja.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/wakuzulurosub.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/tagefomawoxogenazivobugoj.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/35286296716.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/wabukupalidozoditugixem.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/gudugalidigon.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/73930289978.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/50221264980.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/sotozapofudarapaxiv.pdfIn PDF document text
    • https://advik.net/userfiles/file/6561026470.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/59910748328.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/xitax.pdfIn PDF document text
    • 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_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 17832 bytes
SHA-256: 43bda736fbfbfedfea348fbcb3a755f4daf91193f182ac693edfb31a5dc73a3c
font_01_sfnt_off00011985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11985 10948 bytes
SHA-256: 1c517b2bee773a2835f98919fd6a50e469c9397c5bba90968679de041984b833
font_02_sfnt_off0001327a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1