Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2725988613bd947…

MALICIOUS

PDF

67.2 KB Created: 2021-03-23 09:36:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb1ba2c1b5257043c3f096ca66880851 SHA-1: 2f66f8f72ea57a1990f82ede6ba3e6bd0f6a004a SHA-256: c2725988613bd9476db6a4135c7c104a92abe59a0c5967436ba033bdd323657a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=endocrine+society+clinical+practice+guidelines+cah
    • http://mazafaka69pussy.online/www.9xtunes.com_english_albums0qpo7.pdf
    • http://laulu-go.ru/481775033012lh1g.pdf
    • http://legko.travel/hp_deskjet_2131_wont_printkqboz.pdf
    • http://1xbet-registrat.site/vineland_adaptive_behavior_scales_second_editioned56n.pdf
    • http://epipog.com/brian_eno_music_for_installations25uz0.pdf
    • http://baffer-shop.space/11_snf_kuvvet_ve_hareket_zml_s44m2l.pdf
    • http://topsol.xyz/faforozasucvw2p.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5de9ed01-d610-4143-94db-6f998645a8ce.filesusr.com/ugd/1d8bf6_b71d4f55b9c341c18ccf1404cb869d4f.pdf?index=true
    • http://figofubinodafe.rf.gd/email_template_for_school_admission.pdf
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_2daf66d8e3d24efbbd8fae435b69ebd6.pdf?index=true
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_ccbc515fe1ba4d20941804105947b26c.pdf?index=true
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_6ed10d4bce5a4205b24a1215fb1b26ab.pdf?index=true
    • https://493bec68-9173-4746-b2b7-4781fafe5c96.filesusr.com/ugd/3bcfef_38ed21ca09a745e485ed52f07af538a8.pdf?index=true
    • https://9dc8676a-0e58-44ee-a512-e339c7094702.filesusr.com/ugd/7c0652_982f80fec4a8478694717cf1966d5297.pdf?index=true
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_d3e3848d58724f4d8c44c1fe1111bde6.pdf?index=true
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_d6d9ea176b7e47fdb2c00ed81d9af9bd.pdf?index=true
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_13a4b91d592840678ea7311ef2d5e22a.pdf?index=true
    • http://puwixatokido.epizy.com/conjuntivitis_bacteriana_en_lactantes.pdf
    • http://vivizegijarugip.epizy.com/tidusototenifog.pdf
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_7b0e458591654fcf8bd1a5643d1de1b8.pdf?index=true
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_4d51cba396194acfbbbd4a1f788b9563.pdf?index=true
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_77006b834a474c179a0c589c538f847e.pdf?index=true
    • 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_off0000cb07.bin
ee86004f47c6845a759c88e892aa9e4777882d9972a2e5ab13421c2960824828		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB07 5396 bytes
font_01_sfnt_off0000dd5e.bin
209659bf523673b0433f89818e1c5f25116c826a6cfd6a8616d6cdc77008c92e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 9840 bytes

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