Malicious PDF — malware analysis report

Static analysis result for SHA-256 7090003ab253ebf5…

MALICIOUS

PDF

78.1 KB Created: 2021-03-25 04:35:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 92d9e91494257ddd2d5ce1d1028a8970 SHA-1: ce3d35bb17e3d463ce57c1d8a9eee3b598038c38 SHA-256: 7090003ab253ebf530e2ea09418377a0c3b092cd13f61f63c36e61a3991eea95
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to educational content, aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+to+study+after+civil+engineering In PDF document text
    • https://static.s123-cdn-static.com/uploads/4379626/normal_5fdf208fa04be.pdfIn PDF document text
    • http://golomashvanna.xyz/an_inspector_calls_2015_full_movie_downloadg5fq6.pdfIn PDF document text
    • http://demask.space/78544608851hidgr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_600a58d8c47ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422390/normal_6033f100d23c1.pdfIn PDF document text
    • http://stylecurtains.com/apostila_de_matematica_para_vestibulari22l0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387411/normal_604984f35622c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451927/normal_5fcba59ec5815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_60367e29f36c7.pdfIn PDF document text
    • http://raisinshub.club/watch_war_and_peace_online_freepeqqk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445735/normal_5ff13e965bc21.pdfIn PDF document text
    • http://hyipinvest.site/delonghi_safeheat_heater_not_workingoqwhs.pdfIn PDF document text
    • http://tujokatoxeg.22web.org/13249568340.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea9194fc-71ec-4bdc-b38e-7f33bea318ff/6183800856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cec19c1-9646-42d1-b5d0-bd42c835c24b/asmaul_husna_adalah_nama-nama_baik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51f2c75f-71ac-4dc5-b0da-f7e9ccb971f0/epix_war_of_the_worlds_cast.pdfIn PDF document text
    • http://kokujizodipe.rf.gd/rigepopubukebonup.pdfIn PDF document text
    • http://pubedirezenara.epizy.com/65703956229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79c49621-f9a7-4b39-bda3-72efac1ccb1c/zabobutukelozuxapuloge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e24a181e-a8e6-4b18-acd2-d69b622a33b3/matlab_plot_marker_type_filled_circle.pdfIn PDF document text
    • http://zizizototumat.rf.gd/exercise_past_perfect_simple_and_continuous.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72c025fa-d52c-41d6-aec1-5e59f0fd7ac5/zuvidalaxolaku.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_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 5456 bytes
SHA-256: 3e8880a532983867194c317044d756e7c1514499bb2cee28ec8ff893bdc26882
font_01_sfnt_off0001091d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 9724 bytes
SHA-256: d8fa0c9768dac472f6f392b8be4e8aa3e6c6327aa6c29064f400f9aa0bc0ec32

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