Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0909dff066b23be…

MALICIOUS

PDF

73.2 KB Created: 2021-03-08 15:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 60b015d9db9856293523ea3b0e98b14f SHA-1: 98256310a9ae1596776a4a01dbf5b49daac51870 SHA-256: c0909dff066b23be463e20e20cd629c7fab7534e3a6a8a91e3f1641840e9e14f
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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

  • 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://jumiwimov.ru/123?utm_term=spider+man+ps4+dlc+trophy+guide PDF link annotation
    • http://sajiwurejedetu.sportsontheweb.net/50473027214.pdfIn PDF document text
    • https://bunafigokakataw.weebly.com/uploads/1/3/0/9/130969192/229c8adc03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5fe80a70a206c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_603c5a939e67b.pdfIn PDF document text
    • https://pozopili.weebly.com/uploads/1/3/4/3/134310053/muresegizane.pdfIn PDF document text
    • https://dunifavopugi.weebly.com/uploads/1/3/5/3/135312205/defare-dobuledas-ziduwupag.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/2003_saturn_vue_transmission_control_module.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_784db58cdaee494d82b00c49b793422e.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_350a1c1db06c43a2b751b4c1bd209dbb.pdf?index=trueIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_169844254b054bac9eebcedba4a0d043.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_a7ab6b041f094dacae9937d18797c633.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63a315c4-96a5-40af-a913-546b33317e93/project_management_professional_pmp_certification_course.pdfIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_428aa0b5b6164b1686b5cd45d7ddd64d.pdf?index=trueIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_82d054cbab7349d88fde62440f6dc71c.pdf?index=trueIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_352fc28eb05943f79788c9f424177830.pdf?index=trueIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_b2f8420f957f49f2819cb77610c5e254.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9879e59b-a655-4adb-940e-c0cf652125ae/how_to_reset_a_honeywell_thermostat_th4110d1007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f71c161-3726-417d-951a-f1a137d9fad1/34164987015.pdfIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_d714d112f54f4e58a1b446beb1ed0a83.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_off0000df26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF26 5780 bytes
SHA-256: e2f03acd17b6e3f47b6615c250f532d6f47a4c4cd69e52e5b9a828d58ca13eff
font_01_sfnt_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 10836 bytes
SHA-256: b6f2ffa03dbdae9d870eee15eff963937558f744817f700d551240b935c9b6d1