Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2839361e4dd065c…

MALICIOUS

PDF

77.1 KB Created: 2021-03-28 09:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9707e6466e393dcda129a2f31095a2fe SHA-1: 7965d39aa9d0aad8bbd854f81d149d4fc3f5fbb7 SHA-256: f2839361e4dd065cd80d9d95effb48b6196d4687044b00cdfcfe47f81a66d9c8
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the document's structure and embedded links are designed to redirect users to potentially harmful 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://vilenefex.ru/strik?utm_term=how+do+i+do+an+image+search+on+my+iphone
    • http://idealslimitalia-oficial.site/what_is_the_best_roast_for_a_pressure_cooker396fl.pdf
    • http://cucoupon.info/86272870732gfwiv.pdf
    • https://static.s123-cdn-static.com/uploads/4420907/normal_5fe4e2f9bb1a7.pdf
    • https://cdn-cms.f-static.net/uploads/4494866/normal_603233bace640.pdf
    • http://design-kvartira.info/ryobi_scroll_saw_sc162vsu9kjx.pdf
    • https://cdn-cms.f-static.net/uploads/4367283/normal_60324b28172d7.pdf
    • http://antileqphh.site/293087978515laye.pdf
    • http://kellys.space/velonifokisevisetifupeduyyvr8.pdf
    • http://zoosalon.org/dan_brown_inferno9i5u7.pdf
    • https://cdn-cms.f-static.net/uploads/4485016/normal_5fdbc2e940820.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_8a48cb8504d847acb3eb192334c0aa78.pdf?index=true
    • https://uploads.strikinglycdn.com/files/581574bc-59da-4b6e-bbf9-db1c46f4f936/los_caminantes_mp3_descargar_musica_gratis.pdf
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_bc69c971db9b415bac11ef9a84b43622.pdf?index=true
    • http://gisobugiwe.rf.gd/60984796153.pdf
    • https://uploads.strikinglycdn.com/files/0d52c56a-3f93-4016-a86b-8e10a802faa2/crafting_and_executing_strategy_21st_edition.pdf
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_2709da4520a848be99bf3974014b4e34.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c37422e0-c036-43aa-8471-679051181b06/how_simv_mode_works.pdf
    • http://kosidigipetuvu.epizy.com/jiripedewukimiji.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec8a.bin
e58eb03bd6c9d216d8de4f0b4a6e61776801f3953e2acd496095590c0ccdf80e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 5608 bytes
font_01_sfnt_off0000ff8a.bin
c3ce5267c7fabf4afbca0829520f978a8b6bf444b04f2221a0882a90023f800e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8A 11140 bytes

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