Malicious PDF — malware analysis report

Static analysis result for SHA-256 e546b7da60e8893b…

MALICIOUS

PDF

94.6 KB Created: 2021-03-14 16:20:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a65fae7cc2d5a74441cabf659a68d9ed SHA-1: 5b36e8c709b83a29015c0b383081eeda84f28e65 SHA-256: e546b7da60e8893b3720bc72c445e760327f7cd2388bac017c0113f939ae96d5
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 0.9998

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://jacksth.ru/strik?utm_term=how+to+turn+off+mr+coffee+clean+light PDF link annotation
    • http://xofofumireke.mypressonline.com/fomezakilexaberu.pdfIn PDF document text
    • http://nigasheff.xyz/kingsley_hot_foil_stamping_machine_owners_manualx575f.pdfIn PDF document text
    • http://sazulido.medianewsonline.com/best_buckshot_choke_tube_for_browning_a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_6010900f1dd51.pdfIn PDF document text
    • http://rulajamizap.getenjoyment.net/cambridge_english_proficiency_download.pdfIn PDF document text
    • http://hallop.xyz/autocad_for_civil_engineers_freeb9h9q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_601679f53108e.pdfIn PDF document text
    • http://impergamon.com/national_highway_traffic_safety_administration_permitx7659.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/50141205303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/076c29cc-79d1-4905-903d-32f2fc0308ae/massachusetts_drivers_license_restriction_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/vizio_32_inch_tv_1080p_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfca071d-999c-48d6-9a01-630909c25a51/onkyo_ht-r560_price_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab760d9-63d2-4b7b-a1f4-e42d22f5606b/2005_toyota_tacoma_radio_wiring_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/juketibulelujozafidofenaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18190f3b-6403-4982-9fb8-c41a04f2fad2/how_to_operate_a_rca_universal_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07832cab-d7d3-4e31-b078-82f6bf996bd3/luxubarofuzitaj.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/titanewupizevevimeje.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_off000133ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133ED 5168 bytes
SHA-256: e94a3a9c1f4a4a23d70172faf76b28aca1cef6a7ac0cccd4eec480575364d546
font_01_sfnt_off00014569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14569 11928 bytes
SHA-256: dbda0cb7a4001a54f96c2272a575abbf5ad95a4a796f7b4ff4f8eabc39ab12c7

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