Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40d86489e3acfd5…

MALICIOUS

PDF

74.0 KB Created: 2021-03-17 02:11:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a68e4b9e1c3a71083b1def356ef7f042 SHA-1: 2f0545aa3e65ce1d433faef2dff058f0db3bec1e SHA-256: b40d86489e3acfd5e224c696e3c1ef05dd04c0a008013afa50079a429d5ec809
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to potentially harmful sites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=solutions+brother+windows PDF link annotation
    • http://worldworkbook.com/how_to_measure_the_interior_angles_of_a_polygon3h6tl.pdfIn PDF document text
    • http://dogisutuzise.22web.org/algebra_nation_book_answer_key.pdfIn PDF document text
    • http://pililiriniru.mypressonline.com/neoliberalismo_institucional.pdfIn PDF document text
    • http://basepati.22web.org/internet_manager_version_6._35_crack.pdfIn PDF document text
    • http://usacreditscore.info/zivikapiruvumasexaa3olj.pdfIn PDF document text
    • http://bopugafuwu.scienceontheweb.net/89246674176.pdfIn PDF document text
    • http://nibelv.xyz/duwulusofivg05q7.pdfIn PDF document text
    • http://saduzemed.mypressonline.com/ny_dmv_knowledge_test_class_d_answers.pdfIn PDF document text
    • http://wordsideget.top/niralilageradaloel6bp.pdfIn PDF document text
    • http://xalapuzim.sportsontheweb.net/libro_budismo_zen_y_psicoanalisis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/49553690880.pdfIn PDF document text
    • http://vosimamasi.epizy.com/modernist_cuisine_the_art_and_science_of_cooking_review.pdfIn PDF document text
    • http://titetirif.epizy.com/manhattan_prep_gre_strategy_guides.pdfIn PDF document text
    • http://rekuzek.epizy.com/questoes_de_concurso_administrao_publica.pdfIn PDF document text
    • http://lofunadex.myartsonline.com/probability_questions_and_answers_gcse.pdfIn PDF document text
    • http://tereralubo.epizy.com/urbanismo_tactico.pdfIn PDF document text
    • http://rixuweba.rf.gd/14778263492.pdfIn PDF document text
    • http://xewenofos.epizy.com/gufefovasip.pdfIn PDF document text
    • http://vubixegigag.rf.gd/romeo_and_juliet_act_v_scene_3_questions_and_answers.pdfIn PDF document text
    • http://biborufa.epizy.com/xotawojibekodalas.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_off0000e531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE531 5036 bytes
SHA-256: 93028a58c03af905215ca881d49e67c70cc9f9fca738c32b7712bcae7cf93756
font_01_sfnt_off0000f656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 10924 bytes
SHA-256: 8c6c249a0c03e74d15dc4b1eaade41a903ff97c3af953280a77b91e01b1f0eba

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