Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84b1a72504c7561…

MALICIOUS

PDF

74.4 KB Created: 2021-02-26 04:37:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9690abce6c8cbf8ee4c07b5c6643f9ce SHA-1: b0a9ac47b8ed6959a754263eb3731b65588fc4f6 SHA-256: d84b1a72504c756150eaa89acb0d660ee1397102d7de8c4995f8eefa0ea351ca
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to lead the user to a malicious site. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious intent to redirect users, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=zoll+m+series+manual+de+servicio PDF link annotation
    • https://cdn.sqhk.co/gorokipo/hjFhBH9/vevexamuxexesoponib.pdfIn PDF document text
    • https://xebigami.weebly.com/uploads/1/3/4/6/134661154/belirobogow-jelitazizifuxeg-wudewajediviji.pdfIn PDF document text
    • https://talaxekagaros.weebly.com/uploads/1/3/5/3/135347480/8164571.pdfIn PDF document text
    • http://detonic-de.website/98649939928zhguc.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/a3IZq8L/tropico_6_dlc.pdfIn PDF document text
    • https://ruzutemeba.weebly.com/uploads/1/3/2/6/132681300/xelixesunos.pdfIn PDF document text
    • https://cdn.sqhk.co/didatife/idFRihN/merge_dragons_cheats.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417032/normal_5fddd915435f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366313/normal_5fcdd62d33bb3.pdfIn PDF document text
    • http://workmonster.net/allegiant_phone_number_live_personp18yu.pdfIn PDF document text
    • http://curvepreloved.com/best_soccer_manager_games_onlinehpj9q.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/ghZhfhd/11710497160.pdfIn PDF document text
    • http://petersikdar.com/tadekulisudiworosomotapgy9dy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403959/normal_603026cb068ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vodukatova.epizy.com/84063143615.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 5104 bytes
SHA-256: c4ee2a64d67830afb00951cbfec511aa5a819b6976e6f54a8200713c6f9a1dd5
font_01_sfnt_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 10032 bytes
SHA-256: 285a43b95ad0672a017927d77d5646b04ec28bce104d9478f1a9c13649c07dae

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