Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7379c49a623e12…

MALICIOUS

PDF

68.9 KB Created: 2021-04-27 01:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ae9eabc6cc8b64b4958241d8683013a9 SHA-1: 1d867a4401175f27323f42edc3d4515d4ea35943 SHA-256: 4c7379c49a623e12bcb9b2a452ba9183773304f71eb76fd05dc93fbf2858b105
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://kuzutuzo.ru/strik?utm_term=hp+w2207h+monitor+drivers+updates PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469116/normal_600f0f561f1d1.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/99191653989.pdfIn PDF document text
    • http://wabaxifejem.sportsontheweb.net/13163863742.pdfIn PDF document text
    • http://zifufarox.getenjoyment.net/tutorial_stored_procedure_mysql.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481285/normal_603b5e5bd9411.pdfIn PDF document text
    • http://pifumufupes.iblogger.org/tecnologias_emergentes_en_alimentos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427793/normal_5fd97156964ce.pdfIn PDF document text
    • http://tikonazab.iblogger.org/24468295314.pdfIn PDF document text
    • http://tamawasobo.sportsontheweb.net/90681068156.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390097/normal_6006b43d18d98.pdfIn PDF document text
    • http://duzegotola.medianewsonline.com/hpi_baja_5b_flux_manual.pdfIn PDF document text
    • http://defokozixeral.sportsontheweb.net/how_to_use_kitchenaid_mixer_professional_600.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/types_of_cables_and_connectors.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_86de3c587cdd41e3944859c7a3856b0b.pdf?index=trueIn PDF document text
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_8987a8c7005e4799a69643d53b765754.pdf?index=trueIn PDF document text
    • http://xojixitutatafu.epizy.com/20373120488.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/avery_labels_4_per_page_landscape_template.pdfIn PDF document text
    • http://vegiwotunoxatak.rf.gd/what_are_shield_volcanoes_formed_of.pdfIn PDF document text
    • http://zakevopeporo.rf.gd/autosar_tutorial.pdfIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_97d74a815e5f4033aa964dba5ea4e631.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/edw_enterprise_data_warehouse_definition.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_e97fc2560317480293b56980f6b23dc2.pdf?index=trueIn 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_off0000cfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA9 5636 bytes
SHA-256: c1f74988e381c9b402384ba4ff3d1f5a4e5c56e0af89bc782b5d94cec377b861
font_01_sfnt_off0000e2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 10228 bytes
SHA-256: 0b7d77774b58ff24d1fbd3bbe5d955707be0bb121228a9af9ec578bcd5b9c6c2

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