Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ebdf3b240a158b6…

MALICIOUS

PDF

82.0 KB Created: 2021-10-05 13:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 970e31b0fdcd7e56297a4cf7bbc288d3 SHA-1: b28fb049be687a9cb59dee96c257b2dd35730cde SHA-256: 0ebdf3b240a158b6e6b1726879cb4ebbd31421d873a73c6dc7d46334812cb68b
66 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the presence of many external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=to+prevent+possible+data+loss+excel PDF link annotation
    • http://hoangduy.vn/vn/files/nirozutumofewuk.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/banoxi.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/42212550299.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/diripi.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/75129090731.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/bigivulagur.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/70890929182.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/64392215221.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/57065019948.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/66f60fefc6064cae144a66b62a3ad293/jizulisapu.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/vigekomaxusogijokasab.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/vaturufujigalutesozivi.pdfIn PDF document text
    • https://onecre.com/images/content/files/guburasepef.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/49453568508.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/6463215641.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/mepekonigojebek.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210910_034224.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/delitefimujigadopox.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/mizibutajukasewe.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/dofegejawovemuj.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/pefuku.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091313010473499.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/25706059783.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_off0000db86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 10780 bytes
SHA-256: e70b567910cfec66afc508ef07e987972bffec2a5b974589ca34042f5c23eb0e
font_02_sfnt_off00010c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5C 17724 bytes
SHA-256: 8e4cc6ddba86dd8aa5371357c3953c4823aca74d788cbba714e8314434261ea1

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