Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca65b7bb96a30b8…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 05:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bcf07497ce6c05cfc08bc17485aac021 SHA-1: 6b44f6aa77abdc7839982674291c4ddf30f12b9a SHA-256: 4ca65b7bb96a30b8969f2aea3bad47fe855692f5f8dd46732e474d2007de1921
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of distinct hosts and links, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.musicboxpiano.com/contentfiles/pokagubunixujazuwatemali.pdf In PDF document text
    • http://clainvest.pl/userfiles/file/mojikekivubix.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/14837378948.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/savusukefigasur.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/74354389116.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/672c64880bff2180deafec60f60a494d/lotitumebi.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/livigenajopubedof.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/8774996403.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/49933402869.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/nifasisijefiduvavilofo.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210921050748.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/wivudixavavabaw.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f61548b44---38422171150.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/51584544279.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/sudimogijoguxug.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/bubebijig.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/6051868772.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/pisamewun.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/1573248771.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/xesem.pdfIn PDF document text
    • http://innersolutions-uk.com/file/nerelumiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=monkey+balloon+towerPDF 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_off0000d543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 19212 bytes
SHA-256: aecd5b429e4beedde808491aa93b530047bc4b1ab83bb9ebebb3b19ad24e75c9
font_02_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 10268 bytes
SHA-256: b41bfa4d98c7d4090ce15d471468032016030d8a395b0e1f371b605af73877a4

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