Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71154fc2245a37d…

MALICIOUS

PDF

70.6 KB Created: 2021-03-03 07:02:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d3eb285c565ccb0231b3b9f8d5878ee3 SHA-1: 05929150dc131eb8acedf5879815790a2c7d6128 SHA-256: b71154fc2245a37d041c2991241bb03804dc1c76e84f1291b96817f3a542ad36
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a potential phishing lure related to 'catawba county gis deed search'. Heuristics indicate the PDF is part of a link farm hosted on disposable domains, suggesting a campaign to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=catawba+county+gis+deed+search PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377938/normal_6004794bdb223.pdfIn PDF document text
    • https://cdn.sqhk.co/gatavazer/jgQfKom/drum_set_for_sale_used.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/ghUeibY/wezulusofabuwikijoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/Kia48hj/ear_wax_removal_doctor_las_vegas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418791/normal_603bd8c3f3c70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386824/normal_603eff232bd47.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/vhdy3Dd/94519069311.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/hggeKfx/larva_memory_card_gamestop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456389/normal_601394385bd88.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/hha5Z2h/manager_tools_training.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/4hd5jic/exercise_ball_chair_with_back_support.pdfIn PDF document text
    • http://wevesapawuzu.22web.org/siwet.pdfIn PDF document text
    • https://cdn.sqhk.co/junizafuzep/R4RD42b/ice_cream_recipe_cuisinart_chocolate.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/pibabopuduj/assured_shorthold_tenancy_notice_requiring_possession_form.pdfIn PDF document text
    • http://vukefuxi.epizy.com/kisadoxejimebezokojebo.pdfIn PDF document text
    • http://sujonereduvuk.rf.gd/61525698441.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/audio_language_converter_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/38909635642.pdfIn PDF document text
    • http://nenunosulijud.rf.gd/personal_business_card_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/safaxetujukaku.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_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 5408 bytes
SHA-256: e16afa6c1be5d8cad6c658c64fc0bdeb47a3168695cbd88b6eb9fb2e17318d2b
font_01_sfnt_off0000e9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 10296 bytes
SHA-256: d3d720bb4434e6b3855598dd2890461ca418fd2c9328da476305b44ce592485b

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