Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b6c328aa845078…

MALICIOUS

PDF

90.1 KB Created: 2021-05-30 02:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 820c1450f04294b08212dfd958fc2768 SHA-1: a8d5e9874f6abf6a8e1c176e79e590a8df2204af SHA-256: b0b6c328aa8450786515da621438f35d3764a187659ed2515263d70ebcd8829a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://larunigilusevim.weebly.com/uploads/1/3/5/3/135320243/5031686.pdf In PDF document text
    • https://jijubukaxujofi.weebly.com/uploads/1/3/4/8/134892288/8762710.pdfIn PDF document text
    • https://wirolarem.weebly.com/uploads/1/3/1/6/131636642/3565329.pdfIn PDF document text
    • https://vinezizonevo.weebly.com/uploads/1/3/4/3/134320549/a69c9d56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409799/normal_602ee3baa73f3.pdfIn PDF document text
    • https://makemefezixila.weebly.com/uploads/1/3/4/3/134355794/7957500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370985/normal_6031af5007858.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411944/normal_5fc6ca7a3fca3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412415/normal_5fcbe06e40738.pdfIn PDF document text
    • https://kesegupopu.weebly.com/uploads/1/3/4/1/134131766/matonovom.pdfIn PDF document text
    • https://gonoloxezejuje.weebly.com/uploads/1/3/1/4/131410007/6938954.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/_7yJ53orglQ/wb?keyword=libro%20perd%C3%B3n%20de%20chiquis%20rivera%20pdf%20gratisPDF link annotation
    • https://uploads.strikinglycdn.com/files/42b80332-c0e4-4174-9436-9f248ccbb753/trx_fitness_routine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26beb1c8-f190-4dda-8648-6839faa1cc08/30268001281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25c8b5ed-c905-445a-9d9b-e18b9d7840e3/how_to_use_lowrance_hook_3x_dsi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/065cb6bd-456a-4d7c-9767-590d4062f44a/dimuwobamagezun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfeed965-1b03-42e6-a112-64d30e589c99/star_chart_poster_custom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6bf7a42-da19-4e37-be39-e2a390969c08/grill_floor_mat_for_composite_decking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b7789fa-9163-41f8-a57f-e73118a6217e/bissell_crosswave_pet_pro_2306_upright_floor_cleaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb3ac072-c0e9-4e41-93d8-00a8bcf8b7f0/23746305036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57dc4a9e-f295-48db-a04f-5a47d1b99613/android_app_development_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d92335e-8031-4864-99d3-7cb5ac7418a4/fuxetazenelewago.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D69 5672 bytes
SHA-256: 42efc199e8dbb57be8285ad958a52a54c4b69d7b74ed538b21096f0f7ceb4b2e
font_01_sfnt_off0001205a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205A 13224 bytes
SHA-256: f482d02e51d61114c4d4b050a309ee478c9c3d5fcdcad2b93d9828e0ed64fb64
font_02_sfnt_off00014abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABC 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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