Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e73a2427014c67…

MALICIOUS

PDF

69.0 KB Created: 2021-04-06 14:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 674ae5406939bbfe232ef317f1e8ab89 SHA-1: ceead540573b20d996599edf8df6b2db9e97ef1b SHA-256: 84e73a2427014c67fad4d9d812e5c93f8e1cf785f25e638afb15300220fa196b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with a primary suspicious URL pointing to 'resalured.ru', suggesting it's used for phishing or to download further payloads. The PDF structure and embedded content are consistent with a lure to trick users into visiting these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://resalured.ru/award?keyword=kuk+b+tech+civil+syllabus+pdf PDF link annotation
    • http://palikexifumalam.mywebcommunity.org/77265723506.pdfIn PDF document text
    • http://yourbigdick.space/ashokan_farewell_tabsvo9v.pdfIn PDF document text
    • http://tumbaa.space/horse_side_vet_guide_appe133f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493917/normal_606ac2f1bd0ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496170/normal_5ff147eb9f40a.pdfIn PDF document text
    • http://muzomabavima.medianewsonline.com/giroxutikegadugixusiguton.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415767/normal_600655f732607.pdfIn PDF document text
    • http://itdomen.fun/cc3_selected_answers_chapter_5vw5bj.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/cerfa_13750_x_02.pdfIn PDF document text
    • http://vezukugijisepo.scienceontheweb.net/personal_loan_agreement_form.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/c0933a45-3176-4f34-9c44-a50b351a0b2c/mofikerufipisesuvisate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3065e17-001c-4451-9dee-8803c23c1ce4/malibu_transformer_photocell_sensor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62dc45ce-e23a-46ca-9ef8-f4cfdad656d1/propiedades_mecanicas_de_los_materiales_definicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd601f95-5d26-4655-9a76-e8c356e90ab4/wofizagetivefanaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70bfc65e-70f4-4467-818f-47a82d3b772e/81459053585.pdfIn PDF document text
    • http://bowegasobufur.myartsonline.com/blueprint_to_mass_phase_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af492753-a5a9-4a43-8f67-7bf7f2d95a0a/gefopalakufesemidol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2888ea4-995d-4c0e-85fe-7bddd6ea723a/why_wont_my_roku_remote_control_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd2fcb22-77d6-4e86-9271-8e92a06aa340/wapar.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_off0000cff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF6 5484 bytes
SHA-256: da369221f756165666cbcb67f627757511d2df9b8bd0582b607004ff5fcbf389
font_01_sfnt_off0000e2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B0 10620 bytes
SHA-256: c468a41483d51fa145ca4ef869e955aea3adeafae305e423f95b23cd3539c6ca

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