Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42192b435a951fc…

MALICIOUS

PDF

53.2 KB Created: 2020-11-07 10:39:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: ea65037068baa23713c4bfa66a2ddb4b SHA-1: 2f63ad5333ff60364a1b5a25420e7a4e11450c6f SHA-256: f42192b435a951fcab594fb755b22ccb087f8f66dcae96d976cc5a6dea4d6281
146 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://traffset.ru/123?keyword=kenosha+dmv+phone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387815/normal_5f95ebb861617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5f8ab092afbd4.pdfIn PDF document text
    • https://topagagi.weebly.com/uploads/1/3/4/3/134337746/5620273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_5f89a1681dc17.pdfIn PDF document text
    • https://fetofopup.weebly.com/uploads/1/3/4/5/134507679/a84b46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d24b3aee-2c1d-42cd-92cd-4f747ad8cc4d/gaposunusiladagewadamoj.pdfIn PDF document text
    • https://wejogude.files.wordpress.com/2020/11/niwasegini.pdfIn PDF document text
    • https://jufifel.files.wordpress.com/2020/11/moduzereto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1db584b-437e-42b9-9255-b24bdd25f9e5/present_tense_of_ser_and_estar_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fecde66-5b48-45de-b14a-924835c040ed/wifolilod.pdfIn PDF document text
    • https://nodumizid.files.wordpress.com/2020/11/75834871152.pdfIn PDF document text
    • https://pozajifu.files.wordpress.com/2020/11/abecedario_completo_letras_grandes_para_imprimir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0cd1f0b-1cc8-4e93-b344-6eea6ffb1fa5/clay_county_nc_register_of_deeds_office.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a4c025d-fbbd-4936-a73c-1e38e75dff7c/85404721539.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_off00008f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F41 5100 bytes
SHA-256: a304bc9128d08f51ecd82c1e2d71e776a89cee81633e9af55211f0fe4ef3b492
font_01_sfnt_off0000a083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA083 12216 bytes
SHA-256: ea83cbc0e1a7ba6ee5c80b950b29cf634e597ddbf8eee201eb84fb0fb05c6ea6

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