Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f93c730de08e75d…

MALICIOUS

PDF

98.2 KB Created: 2021-03-08 20:50:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7b10884f571706f15a04b3dfc052611f SHA-1: 31a3aa13b79a335d2de9325ba5b1273ab7fc95b1 SHA-256: 3f93c730de08e75d58cf82ec4a9f87c9b3804e35f17390b2b9e79e99ce630b2c
66 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and link farms, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm heuristic suggest this document is designed to lead users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/strik?utm_term=stanford+university+project+management+certification PDF link annotation
    • http://rivozuzeno.mywebcommunity.org/16479435.pdfIn PDF document text
    • http://xutexukoxobofi.mywebcommunity.org/roraropebinomezizefijujaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_5fea2c5ed741d.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/why_is_333_a_bad_number.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465396/normal_6015104656834.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414689/normal_5fccb3659b5cc.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/vefelajedumamufiva.pdfIn PDF document text
    • https://cdn.sqhk.co/wimakebibane/36m7OVx/vobavegider.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459624/normal_603c253539f5c.pdfIn PDF document text
    • https://cdn.sqhk.co/xekejegixawo/ihjisib/19014562731.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387408/normal_5fc8d52ed24a1.pdfIn PDF document text
    • https://cdn.sqhk.co/talexadu/TgffhfI/baby_chickens_for_sale_mn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_50914483cce74a02a86720a6bfc36ae9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e7160c8-30b6-4e50-8687-d8cf3db8929c/intex_salt_water_chlorine_generator_parts.pdfIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_354ec1fc44404f61b1435bc381a7ba9b.pdf?index=trueIn PDF document text
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_1d77241fab6442039818465990e9a869.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_82dbbdd8686149a7a72d95db186ac43a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede2652f-abb1-410a-8f18-f539ce0f944b/what_order_to_watch_the_girl_with_the_dragon_tattoo_movie_series.pdfIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_8d9ae889d5104a69a6d4ac855b0b4c23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/896c4b03-c5fc-45d5-96b3-32831100edd9/remote_control_app_for_non_smart_tv_iphone.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/adobe_2020_system_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a818f5-9148-4eea-a6f8-f895c708f17a/slader_fundamentals_of_differential_equations_and_boundary_value_problems_7th_edition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13142 5664 bytes
SHA-256: feeb9c16b9a9858816f19a38cd16ec811a5aedc9ef72c50ee33193bce4fcb890
font_01_sfnt_off00014478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14478 11828 bytes
SHA-256: 358fa9de18d6e8ded19ccf0b126c539430ced675a6c8ac27d000368eabe3dbbb
font_02_sfnt_off00016c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C91 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e