Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdf804708a875d2…

MALICIOUS

PDF

82.9 KB Created: 2021-05-14 17:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 31eb79c80121a6ebfd1219a70c396d65 SHA-1: 9a804cc585e28d49cbaa8f403df9794babf34212 SHA-256: dbdf804708a875d23c59492535084f6656f7a16ffdc32bfd82ac84829fad39d2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to search queries, reinforcing the lure to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=what+is+aeron+chair PDF link annotation
    • http://kixurox.getenjoyment.net/medical_terminology_for_health_professions_eighth_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463264/normal_6015d63d51040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_604348f6ac70a.pdfIn PDF document text
    • http://opencabinets.xyz/screen_video_recorder_for_pck8d2v.pdfIn PDF document text
    • http://hookup673.site/gegajopaw5k48b.pdfIn PDF document text
    • https://wojaduzojipoj.weebly.com/uploads/1/3/4/4/134467580/4e1c40de5c6.pdfIn PDF document text
    • https://goporurozabi.weebly.com/uploads/1/3/0/8/130874573/siwetepu.pdfIn PDF document text
    • http://worldhold.online/pulufozutepogapizepdi67w.pdfIn PDF document text
    • https://vurineju.weebly.com/uploads/1/3/2/7/132741272/5422645.pdfIn PDF document text
    • http://pixubak.iblogger.org/google_sheets_conditional_formatting_whole_row.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401732/normal_5ff2610e3c57a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387242/normal_606947efd522f.pdfIn PDF document text
    • https://kukurako.weebly.com/uploads/1/3/5/3/135321284/7733847.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418583/normal_6001d92a2ae1f.pdfIn PDF document text
    • http://setofexperience.site/estilo_de_vida_definicion_operacionalriy4j.pdfIn PDF document text
    • https://nikitepiwaligu.weebly.com/uploads/1/3/4/6/134647260/sifamali.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/libeganot/apa_format_citing_website_in_text.pdfIn PDF document text
    • http://xutevifiwopad.rf.gd/how_do_i_stop_software_updates_on_my_samsung_galaxy_s8.pdfIn PDF document text
    • http://nedomovoguluz.rf.gd/tabiwadufolizaj.pdfIn PDF document text
    • http://jowosos.myartsonline.com/bose_wave_music_system_3_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/android_auto_wifi_mazda_connect.pdfIn PDF document text
    • http://lejiletuvasipib.onlinewebshop.net/beginner_english_lesson_plans.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_off00010431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 4868 bytes
SHA-256: c72147c8d6056aebbc6f5fba5724df8a61d147d375983fece11be3a8edcf817b
font_01_sfnt_off000114c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C5 12096 bytes
SHA-256: cea070f62ae86bc8b5924d577470e5bc9817825ba8489eed3178b07b33da4237

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