Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11d59ca2e6d3f66…

MALICIOUS

PDF

80.2 KB Created: 2021-04-21 04:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d5d35bb310630c611221994db42b0f6e SHA-1: d12acab08cafaded6806f3f6bc5a8d58a13eda5f SHA-256: e11d59ca2e6d3f663fc82f05ba9969d297a9bc512a620478826c9720d85e60ba
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a high-confidence ML classifier indicating maliciousness. One prominent URL, 'https://jacksth.ru/strik?utm_term=is+the+stock+market+open+on+martin+luther+king+day', appears to be a lure, disguised as a search result. The document's structure and the presence of many disposable hosting links suggest a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/strik?utm_term=is+the+stock+market+open+on+martin+luther+king+day PDF link annotation
    • http://bettyloustintruckbbq.com/gufesasitujumilekuvupudf0mcq.pdfIn PDF document text
    • http://presentinsta.online/80323343327kmgz8.pdfIn PDF document text
    • http://profaudit32.ru/arya_2_video_songsq6fmu.pdfIn PDF document text
    • http://teksalon.xyz/uat_test_plan_template_example5ny9h.pdfIn PDF document text
    • http://teachost.com/bachon_ki_kahaniyan_in_urdu_booksr20yk.pdfIn PDF document text
    • http://xutarima.22web.org/breve_historia_del_neoliberalismo_harvey.pdfIn PDF document text
    • http://service-hire.com/dimepitigoxazibirigeb4hj3.pdfIn PDF document text
    • http://creamwalls.online/92295466099uxxn3.pdfIn PDF document text
    • http://milansit.space/360_leader_john_maxwellyopux.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://mexicotop.xyz/79881788792zc1z0.pdfIn PDF document text
    • http://swiss-gear.shop/nakipogabuguwajuwojopd7tu.pdfIn PDF document text
    • http://aycotoro5.xyz/64452067258abvhc.pdfIn PDF document text
    • http://dvertsoff.ru/acoustic_blues_guitar_tabsvp4dr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sobilekob.epizy.com/successful_local_anesthesia_for_restorative_dentistry_and_endodontics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17833612-a47d-4b41-b7a1-72efce2e05ac/22778650058.pdfIn PDF document text
    • http://vulikoviluxugu.rf.gd/bohemian_rhapsody_sheet_music_piano_easy_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d78e43cd-9dfe-4f5c-88c1-a1fc996262cc/kriya_yoga_ashram_usa.pdfIn PDF document text
    • http://puxudodasak.rf.gd/agilent_seahorse_xfe96.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5224b5a-a59f-430a-a3fb-e6f711836625/28138537641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/323735c1-98af-4c92-9116-c75486cbfc6c/bililixikopixevepevegirij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ff7bf2-dc2a-407c-8330-4ce6dc6834e5/79113312323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dca04419-b837-44c1-8de8-b00bdc67801b/evan_moor_history_pockets.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_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 5592 bytes
SHA-256: 7f6d531389fda35c85abd89e043a308da509a8883a131bca6a522d95fb38f254
font_01_sfnt_off00010dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAB 11044 bytes
SHA-256: 5175a7112eb83330b769ebbd231693d4e0392370e97121bf88b9426b9a8f2bc4

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