Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1acfae66a26b5d…

MALICIOUS

PDF

122.6 KB Created: 2021-04-10 13:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 72b61021d9855e3992a30c929ef4f11a SHA-1: 251919092d4e26b7281c1f3209aa4cd16b2d1f9e SHA-256: 2a1acfae66a26b5d95e7d96930c89687dbb2fb2f01e018d58d33e503935249bb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and one specific URL is highlighted as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body, though heavily obfuscated, appears to be a lure related to appliance repair.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=how+to+replace+a+fuse+in+a+ge+dual+wave+ii+microwave+system PDF link annotation
    • http://winnerslm.space/is_flixtor_still_downo81ws.pdfIn PDF document text
    • http://xtreme-sport.ru/peter_lynch_one_up_on_wall_street_audiobookaixds.pdfIn PDF document text
    • http://girepodemaz.getenjoyment.net/pdf_to_word_document_nitro.pdfIn PDF document text
    • https://cdn.sqhk.co/mozigizax/ga2XIXU/popilenubozevipavu.pdfIn PDF document text
    • http://linunewilut.mywebcommunity.org/sedupixagubinelawuxenege.pdfIn PDF document text
    • http://elinekici.online/yamaha_mg16xu_driver_for_windows_32_bitm94rt.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/jhiajeM/tinilofatafitubidame.pdfIn PDF document text
    • http://bodyita.space/kumezinisivuzubujoj7tyz5.pdfIn PDF document text
    • http://lojuxaga.mywebcommunity.org/44025860380.pdfIn PDF document text
    • http://loveworld.club/xujoniwikop877c.pdfIn PDF document text
    • http://santecmb-sarl.com/676966832196pgzi.pdfIn PDF document text
    • http://getfreecreditreport.info/brother_pe770_service_manualrmaps.pdfIn PDF document text
    • http://puduvab.sportsontheweb.net/up_anganwadi_form_download.pdfIn PDF document text
    • http://natural-shop.info/lamupebubisagrpje.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxazagugura/cY6aBij/super_moggy_adventure_run.pdfIn PDF document text
    • http://gamuxiwami.getenjoyment.net/91304482866.pdfIn PDF document text
    • http://strahuemsya.info/plataforma_academusoft_utogdvw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duziroro.myartsonline.com/alphabet_book_with_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9436b47d-0b58-4044-aba5-03a9f9b1b5d9/how_to_reset_maintenance_light_on_2013_prius_v.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8054be5-3121-41e1-acd1-4b0263f8b84a/90603888552.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b320327c-f84a-44b3-9f40-91cc871e2341/nolawofegexelabives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1107458-e67d-4788-b01f-26ed751a7ea9/wogasifuva.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_off00019f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F90 5688 bytes
SHA-256: b1fa89b83852f6c3b932a745f5cce6f0b82925773154353a1fc8793ee5d86969
font_01_sfnt_off0001b2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2F3 12304 bytes
SHA-256: 503f0f56cb6b03f4f29833a90e83a8eeb4e571c302f8cf93b29af74a09da23e9

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