Malicious PDF — malware analysis report

Static analysis result for SHA-256 023e0cf7b66db0da…

MALICIOUS

PDF

93.3 KB Created: 2021-02-27 01:50:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 670fa5f7db85d8794a99619ff730ae35 SHA-1: 4afdddc72e4fc1f85eab5efc080a84d5d524860f SHA-256: 023e0cf7b66db0da3dab0c0d1f09f64c21ad5db781a3e229fc6963bec0ee52b8
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malicious download attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/strik?utm_term=medical+website+templates+free+download+html+with+css+responsive PDF link annotation
    • https://cdn.sqhk.co/vewukiziwemi/fgjjeqd/45405177722.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/h1hglgg/zukakuzumum.pdfIn PDF document text
    • http://keksik24.ru/programa_de_honores_ala_bandera_20_de_noviembreur4l3.pdfIn PDF document text
    • http://bettermoneytips.com/9851296460nh9kz.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/gGhjdpF/47777975802.pdfIn PDF document text
    • http://bahis-sikayet.com/principios_basicos_economia_circulargb1mk.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/41KLhge/disney_cruise_pools_crowded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403539/normal_603448babde54.pdfIn PDF document text
    • http://littlenat.space/global_competitiveness_report_2007-_08d0ov6.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/punurum/dofevila.pdfIn PDF document text
    • http://molodetagako.epizy.com/vajezovelod.pdfIn PDF document text
    • http://vonimamodiji.rf.gd/financial_management_case_study_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/audio_technica_at_lp60_usb_driver.pdfIn PDF document text
    • http://wixilapawatos.epizy.com/fossil_q_explorist_gen_4_battery_capacity.pdfIn PDF document text
    • http://kirogebi.epizy.com/2008_honda_civic_ex_maintenance_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/18251089643.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/zezigotifuj.pdfIn PDF document text
    • http://vetageluzox.rf.gd/meniere_s_disease_treatment_guidelines.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_off00012f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F67 5692 bytes
SHA-256: 36f20ad9b01ebcdf1c56dda465762cd112dacf1e9e161e532017700bd3912275
font_01_sfnt_off000142b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B2 10752 bytes
SHA-256: b87d4946c33cb748eb45035ffa7547ed9e604fa7f448c9ba870c06005e30b469

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