Malicious PDF — malware analysis report

Static analysis result for SHA-256 308b5c05f4d03228…

MALICIOUS

PDF

72.1 KB Created: 2021-09-20 13:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 86d2a96b741d044b5c91e29060528b2d SHA-1: bbf4574204814760b9735d84e5e0bbfa69c3cf17 SHA-256: 308b5c05f4d03228ad59b53a9a326128ab830a650a2daed3cd2e6e147654dc8a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to domains that appear to be link farms or disposable hosting, suggesting an attempt to redirect users to malicious content or for SEO manipulation. No scripts were extracted, but the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent through link redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://huntic.ru/uplcv?utm_term=fabulous+synonym+starting+with+f PDF link annotation
    • http://omonetach.pl/foto/ilustracje/file/fenowirawufiferepogalif.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/roxirobedejodadaximow.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/bubikeboniravoj.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/43814893119.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/xerivekavepunekonop.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210911070744983.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/60369647194.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f92919a6a2---tufene.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/weseposejujiregamovu.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/zasefigilugijeturigaraxum.pdfIn PDF document text
    • http://net-marketing.hu/images/files/genixedowibe.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/nivogek.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/16389323132.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/71637852687.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f42b64b3f798c7c39b19ccc743140c9e/65885789192.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/67420124831.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/39061194132.pdfIn PDF document text
    • http://onelove.cz/file/funekejosufofo.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/16311744032.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/zojokuwurukapomefonuxuf.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/zogolatufami.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/sovivatibux.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/22459233480.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_off0000b6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AB 10944 bytes
SHA-256: f7a97779ff383341d709a45c67f242ae3424706bfdb21dc687e6ada92580f909
font_01_sfnt_off0000cfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 16784 bytes
SHA-256: 4e595026a7d1ef1515c6f40d1b716045b099cd3490973790a560eb499c02fe95

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