Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afe03344e0be4d1…

MALICIOUS

PDF

83.6 KB Created: 2021-04-09 15:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 35d7cafd4d9a463384f6ca0157cf65d6 SHA-1: 8396064992bd92d6f2854e639f2af40af478553f SHA-256: 7afe03344e0be4d1a2b1bcbdc8a8109f3fa954f7f4dc92a813b87478c0ba1992
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing or trojan threat. The presence of URLs like 'https://jacksth.ru/strik?utm_term=...' suggests a lure to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=bissell+powerforce+helix+turbo+rewind+replacement+belt PDF link annotation
    • http://lianhua.life/81211794859vy0zu.pdfIn PDF document text
    • http://ufenmac.com/teenage_chore_list_templates0h135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_5fd9955283eb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470014/normal_60538f8f330fb.pdfIn PDF document text
    • http://fherixq.com/jukagezif5n0t.pdfIn PDF document text
    • http://rijebipimaba.getenjoyment.net/44425397644.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446773/normal_5fcca1652b0ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405181/normal_5fd13d5cb1506.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486199/normal_5fe570918acdd.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/gujepiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486220/normal_601c614382a48.pdfIn PDF document text
    • http://ing-jobs-opportunities.com/12764086351tqffo.pdfIn PDF document text
    • http://mini-cam1.club/judoxugw2md2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481522/normal_600e9fde3de8b.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/foneniz/ancient_greek_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119ae24c-de87-40a9-9187-02bc05ade8f4/83624079696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e0a3318-97f3-42d6-bd60-2044e6f3a13b/can_i_bake_brownies_in_a_bundt_pan.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/burger_king_menu_deals.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/warranty_letter_template_microsoft.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/how_do_you_move_mount_fuji.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/global_kms_activation_issues_reported.pdfIn PDF document text
    • http://zobuwijezad.onlinewebshop.net/clever_compress.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3718c9f6-db74-4aec-8526-e0cf484fb04d/how_to_play_saxophone_high_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fb6dc53-8852-4510-839b-f48eff364730/xodixefexofibolon.pdfIn PDF document text
    • http://nanaxidimidi.atwebpages.com/filarial_disease.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_off00010460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 5744 bytes
SHA-256: 829f3bb9a32099d44a4df565fcec827a942053b07ecedb7982b5efc612289686
font_01_sfnt_off000117d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D5 11924 bytes
SHA-256: c2687e3bdb0008e7f33140f9536db831eda3cef2ee4cba435ddb6d0a5ccd6db1

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