Malicious PDF — malware analysis report

Static analysis result for SHA-256 15797c0bcad948cf…

MALICIOUS

PDF

76.4 KB Created: 2021-04-14 20:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6db25d726e341b32e18bc16d8eac458 SHA-1: 7885fc9df494c11106b02b609601e038fb4501c4 SHA-256: 15797c0bcad948cf0ddb03fbb0e7ae01287a14803c55335e122a5695796cf040
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic indicating it's a link farm on disposable hosting. ClamAV detection and ML classification strongly suggest malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely leading to a second-stage download or redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=merchant+of+venice+sparknotes+act+1+scene+3
    • https://cdn-cms.f-static.net/uploads/4447098/normal_60337345af783.pdf
    • http://diluzadumavotux.getenjoyment.net/40481740712.pdf
    • https://cdn-cms.f-static.net/uploads/4489850/normal_601992c2780ee.pdf
    • http://rexevivejegox.scienceontheweb.net/st_caste_list_in_andhra_pradesh.pdf
    • http://wodedutipif.medianewsonline.com/bataninesefagixotugi.pdf
    • http://lowabunuzoxa.getenjoyment.net/que_es_un_patogeno.pdf
    • http://voicebftyi.com/angularjs_template_link_function8chw8.pdf
    • http://wiwajekirutiw.scienceontheweb.net/lobiraribixefe.pdf
    • https://cdn.sqhk.co/nolagutotato/1hd6hj9/86288942823.pdf
    • https://cdn.sqhk.co/dujujema/aheFXji/vutikebawokesilomalafape.pdf
    • http://verifybadgesbusiness.com/restricted_stock_units_tax_reportingtyhhk.pdf
    • https://cdn.sqhk.co/bugininaxi/hj9a5ii/28903137156.pdf
    • https://cdn.sqhk.co/vizefejij/ifjhgec/music_racer_switch_custom_music.pdf
    • https://cdn-cms.f-static.net/uploads/4424036/normal_6014ff018e874.pdf
    • http://winoorama.site/30494395977fvzxg.pdf
    • https://cdn.sqhk.co/bepotedaxus/NiexBhj/2875070166.pdf
    • https://static.s123-cdn-static.com/uploads/4386363/normal_5fe02761cb043.pdf
    • http://doordash.fun/alfajr_clock_city_code589i6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bujekotu.atwebpages.com/adjectives_worksheets_for_grade_2.pdf
    • http://lobopekogolo.onlinewebshop.net/job_application_letter_format_in_word.pdf
    • http://sawurawefivovo.myartsonline.com/calendar_2020_download_marathi.pdf
    • https://s3.amazonaws.com/zemigiduwagafu/68908088319.pdf
    • https://s3.amazonaws.com/divelatoxa/92238279219.pdf
    • 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_off0000edf2.bin
31018dbb8f0906965eaf3749ae71d38811659ff320f57167b9adfe7a27511b75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 5416 bytes
font_01_sfnt_off0001007b.bin
276151f678f949661e1179dc245ce360fa92736c225446aa82c421ec3615063d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 10360 bytes

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