Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c72bd03746cb86…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 06:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 760e428297b5d806dd889b05558c6868 SHA-1: 7f1ddddb8c0f53db2c0e6cbd066b6f6b134ddbd8 SHA-256: 43c72bd03746cb86b2e81b91417f52c7eec610bb9e4aae8ef4ac71e0868d9cb4
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be instructing users to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://irlanc.ru/uplcv?utm_term=how+to+remove+security+pin+from+android PDF link annotation
    • http://karinameal.com/imgdish/files/926404297.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8350ab006b80c3cdf5f9bf30c9627b3/silusunezufowuwaduzor.pdfIn PDF document text
    • http://xycrusher.com/d/files/gojekujowefagomej.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/wanom.pdfIn PDF document text
    • http://jawarakreasi.com/file/madujukapatefof.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/rimoxiziwidenizafe.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/rerim.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/favazuxaxozinugaliput.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/nafemigevokakodob.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/7662165811.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/88623098156.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/dasazojek.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ed77f5a5---negilob.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/59345059861.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/70427283775.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/movirofujugugiko.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/telokigirapajozifimijap.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/14120543000.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/zejosumotodekedunabifuxo.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210912115311_ogznd4.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/dexodizife.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/tuwaj.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/40315352215.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_off0000e78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 11092 bytes
SHA-256: 8c6bd896c847b329ba0e2c7edaeeac0e3dfd0194e3da6336da0f9db4d809a4bc
font_01_sfnt_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11990 18084 bytes
SHA-256: 7f2805f29556bcf2d68b6f952a6155da837c7761192fbf9c28f6d921e073058b

Open this report in the interactive analyzer, or submit your own file for analysis.