Malicious PDF — malware analysis report

Static analysis result for SHA-256 40950a068ce5a63b…

MALICIOUS

PDF

78.0 KB Created: 2021-03-30 02:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d8c588262ae7af05eb330b0d60eebf09 SHA-1: ec65971954cd8a8d72cb39b6d310a9039583503d SHA-256: 40950a068ce5a63b4165a40f3b85b4fe2080abe6626fa7810d2cce6cfdc0b947
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically linked to a 'declaration of trust document template' lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://gimoguvi.ru/123?utm_term=declaration+of+trust+document+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477921/normal_602df17212fa1.pdfIn PDF document text
    • https://cdn.sqhk.co/bupitagalir/iamjbhi/photoshop_tree_brushes.pdfIn PDF document text
    • https://xobagesimijuvu.weebly.com/uploads/1/3/0/7/130776740/jugereb-pinomoxel.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/MghbHig/kudaxexifotalurikatejizo.pdfIn PDF document text
    • https://nigafabap.weebly.com/uploads/1/3/4/3/134377596/kirudegowul_jarebadedut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389809/normal_5fe7916375345.pdfIn PDF document text
    • https://ruwevupezo.weebly.com/uploads/1/3/4/0/134013147/bofezevizururu_gegomolakupifa_wosunerad.pdfIn PDF document text
    • http://viwumurowiwoba.22web.org/50508091667.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365542/normal_5fcbae6aa46be.pdfIn PDF document text
    • http://gosojojokin.22web.org/kaxakovumadunago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_60152bdd5f3e7.pdfIn PDF document text
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/6e0d76853.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/giSZwqH/82953716967.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/d2CggMU/free_homeschool_curriculum_not_online.pdfIn PDF document text
    • https://fefokepixax.weebly.com/uploads/1/3/1/4/131452923/roxutoluxitig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449998/normal_601841ca53ed2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dipapomumekafog.epizy.com/football_manager_2016_cheats_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/digital_logic_and_computer_design_by_morris_mano_5th_edition_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/59180889605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/954059c8-3c65-4d32-a786-03144dc5c0c6/xopidisileviribujufoxus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/218a8942-c814-42dc-b020-1267d1d26983/what_are_artificial_neural_networks_explain_with_a_real_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/881e12bb-2e76-430a-8177-ee92a8feb0bc/philadelphia_eagles_account_manager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f168fa11-aa9e-40ce-b535-43032482335f/how_many_calories_in_a_frozen_hot_chocolate_from_dunkin_donuts.pdfIn PDF document text
    • http://vedogitunenaki.rf.gd/sql_server_2020_management_studio_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/analisis_cerita_anak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf421134-57b7-42eb-955d-45423011d07e/xafotutejojowowoju.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_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 5300 bytes
SHA-256: 0f8f8580a6b559e20536bcf6437713bb0d573ef2cd2ca977aa6aefc1238416bc
font_01_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 10632 bytes
SHA-256: 28fa9418c861d1a0012906bd5556c60480d0bc92f1fb355e7c207b3e2ec90275