Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc873b135c3e1f93…

MALICIOUS

PDF

72.5 KB Created: 2021-04-09 21:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 621867305a6d75cf4f8108aeded6d75a SHA-1: 53181c7ae414b46361dd196edcd8b73990ad4d25 SHA-256: bc873b135c3e1f93a20c8fd67964d44c1c53af036cc5a98c02cf3e8a910a977f
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on directing the user to a link farm hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/strik?utm_term=d%2527link+dcs-5222l+firmware PDF link annotation
    • http://merekidade.22web.org/judekizox.pdfIn PDF document text
    • http://kagesixeti.22web.org/65318374580.pdfIn PDF document text
    • https://cdn.sqhk.co/rekewuneboxu/f1jbsja/pocket_rogues_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/gIjiZ9k/ludo_star_2_2017_apk_download_old_version.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/les_vertus_du_beurre_de_karit.pdfIn PDF document text
    • http://givavipuj.iblogger.org/how_to_find_power_dissipation_in_zener_diode.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/jhhjejk/what_is_bucket_field_in_salesforce_report.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/Jvjashh/download_blocky_car_racer_mod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nitewofa.rf.gd/34887260906.pdfIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_ea72bc4fba254f9091ff2f48b9086090.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/14093562773.pdfIn PDF document text
    • http://jalebuvubo.myartsonline.com/lulaxesavogaketabupelinex.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/cset_spanish_subtest_4_study_guide.pdfIn PDF document text
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_4668e8d823cd469d9e558d881d50bc1c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kukazowox/black_friday_ads_2019_walmart_apple_watch.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_7e2a509ba5c444ed8269e1bbaf1fdff3.pdf?index=trueIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_2c64f29ea6084fb98d04ecb965cb0593.pdf?index=trueIn PDF document text
    • http://dupivet.epizy.com/zexapajumojukoduvo.pdfIn PDF document text
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_974c09f1350f45b9b24d73b1e634022c.pdf?index=trueIn PDF document text
    • http://gajamozaxekega.atwebpages.com/cognitive_psychology_approach_means.pdfIn PDF document text
    • http://tezafafowajij.epizy.com/fufojijil.pdfIn PDF document text
    • http://tufebogepamik.rf.gd/gun_shooting_games_free_for_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/diablo_2_whirlwind_barbarian_skill_guide.pdfIn PDF document text
    • http://vumazudu.rf.gd/39400471705.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_off0000db2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2F 5644 bytes
SHA-256: 06bc57a7ab447497c1c8ba89f9b6182d1582673d17b9ad78e23541afa61ffa56
font_01_sfnt_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 11004 bytes
SHA-256: 0e31a63ad7a22d6876e87781e2d657d7eadb1f8a951752a01b8d9ea446deb703

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