Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e3225cfce414a3…

MALICIOUS

PDF

78.0 KB Created: 2021-09-12 05:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86cc38b7c2864070689ea10a2fc0bf6d SHA-1: b9e761c31b9d070601061a1fd2ef0d20012c0b41 SHA-256: 80e3225cfce414a34b848994a1d0b38523c338abc0a755532612ba45548b5e55
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to a link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 4

  • 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://www.florentmaussion.net/userfiles/File/fidagunimeg.pdf In PDF document text
    • https://ymy-tea.tw/upload/files/talakotizupu.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/44919782425.pdfIn PDF document text
    • http://foxdigi.com/userfiles/file/sizupemulikolaxu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/64765074219.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/80042830972.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/33121960798.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/sejilobop.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109071053051966.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/26474668918.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/gepifexefod.pdfIn PDF document text
    • http://plise.org/userfiles/file/kotifijifenumoviz.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/37490908364.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/48256913250.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/raxinetupenuledadu.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/83814721185.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/59285784860.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/45906683678.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ngcvh2d6ir7cuf9p2jckpkl89o/70650436504.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/baxanewit.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613386b1006c7---46405348007.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/genafebefabadajoni.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/wetuzuwajoxekubutev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=naruto+shippuuden+140PDF 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_off0000bfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE4 21480 bytes
SHA-256: a805f2f242f5565c888d0f65c517d727402f7900781835c1aa16935f3205745f
font_01_sfnt_off0000f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDE 10772 bytes
SHA-256: 95201333cfa9a60d1bb355a3ee8f69cc1a3ac691bb8356166f432b5feb7bad04

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