Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fea9f25d2e8d66…

MALICIOUS

PDF

76.2 KB Created: 2021-03-31 14:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 018e0ed039ecd8580916aac6f8498933 SHA-1: 432ccc0779bef8e2e2c3482417ff7d970df44ca8 SHA-256: 38fea9f25d2e8d66d65370a00dca80ddc4a91d1a64743b5b2da33a3baf57fd84
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many pointing to disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to medical treatment guidelines.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/123?utm_term=standard+treatment+guidelines+for+coronary+artery+disease PDF link annotation
    • http://gupozatu.22web.org/68403257904.pdfIn PDF document text
    • http://soldatskaya6.ru/loot_how_to_sort_load_orderpbwgx.pdfIn PDF document text
    • http://wefabawatewe.22web.org/rabilalolasiko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464724/normal_5fe932b467112.pdfIn PDF document text
    • http://koxudizujan.mywebcommunity.org/famille_asteraceae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414166/normal_5fe020b7817de.pdfIn PDF document text
    • http://timelessdecorum.com/how_much_does_a_photography_course_costt2bgz.pdfIn PDF document text
    • http://tipijijajofupi.sportsontheweb.net/bilingualism_and_multilingualism.pdfIn PDF document text
    • http://help-business-media.com/politics_for_dummies_free_downloadp2dqp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_605128a2279e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489264/normal_603a73d5a13b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zagijoriw.rf.gd/numeros_cardinais_e_ordinais_em_ingles.pdfIn PDF document text
    • http://rupesujutiwu.myartsonline.com/important_maths_formulas_for_ssc_cgl.pdfIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_7787eb32b2f8419694a93313e4110e42.pdf?index=trueIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_994da34c8b0a494f9b31ac0b7acfd9c5.pdf?index=trueIn PDF document text
    • http://kojodidekojamu.rf.gd/nuwimigufimosowonuxeliwa.pdfIn PDF document text
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_3d75af483f174f9ca2ea05949f3e760d.pdf?index=trueIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_ce326aedf73f418c84e20ef3cea6fce9.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_dcafb316e02e4090804e67c83c17a873.pdf?index=trueIn PDF document text
    • https://cee4c475-053c-4dec-97e8-987d41263e46.filesusr.com/ugd/8c25c6_71d192d394fb4cd58745905af068c325.pdf?index=trueIn 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_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 5548 bytes
SHA-256: cbe6d63fc6e2db32e6f44cdff27ac653627bc20246c7fefc38d7f71efeeb3069
font_01_sfnt_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 10628 bytes
SHA-256: c5d1843aee305203336b79e0c6f3691cbbf98a02383aaf0078627ce67bb74ddf

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