Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fae2fd5340738c…

MALICIOUS

PDF

75.5 KB Created: 2021-06-08 02:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 78cf0765ce0682bcb5316337fff35ef8 SHA-1: 94cdd7bf6964587eeea67aea2d9a0587a923f70a SHA-256: f1fae2fd5340738c8a18ffe388f4302400b01874309c9790a17286b7c6ca5e20
66 Risk Score

Malware Insights

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

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 0.9997

Heuristics 4

  • 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://ketchas.ru/pbw?utm_term=eve+online+ship+guide+pdf PDF link annotation
    • https://fevapeju.weebly.com/uploads/1/3/4/4/134468187/8050027.pdfIn PDF document text
    • https://nuresipaxujetun.weebly.com/uploads/1/3/4/6/134683077/kuwadegab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407087/normal_60082a4656828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496391/normal_601916343b0e8.pdfIn PDF document text
    • https://josujobo.weebly.com/uploads/1/3/4/7/134713906/lizunil-sedozitazik-ruvipo.pdfIn PDF document text
    • https://kinamolifurepe.weebly.com/uploads/1/3/2/7/132710726/zakitozijadop.pdfIn PDF document text
    • https://jamibada.weebly.com/uploads/1/3/1/1/131164428/e23cd4b.pdfIn PDF document text
    • https://nidimikijugura.weebly.com/uploads/1/3/4/7/134710695/711bbf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494866/normal_60b8a730272ae.pdfIn PDF document text
    • https://pojebozotez.weebly.com/uploads/1/3/2/6/132695867/sedavapetuso_nibejabinozam_milij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://najapenoz.pbworks.com/f/mp_police_constable_syllabus_2020_download.pdfIn PDF document text
    • http://lewiwebula.pbworks.com/f/notas_musicales_de_flauta_titanic.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/f/slope_intercept_form_worksheet_answer_key.pdfIn PDF document text
    • http://kuduwoxux.pbworks.com/f/fugoza.pdfIn PDF document text
    • http://fuvotobike.pbworks.com/w/file/fetch/144584565/29344507900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e115b3f-2ae6-4e03-9500-e335bc108f50/19853174478.pdfIn PDF document text
    • http://fotikeralo.pbworks.com/w/file/fetch/144824715/lomiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fa5e771-30e3-4753-9574-d29b97a907d9/tijobolefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed6adc01-5e5a-4698-978e-eb65719a99a9/42983489401.pdfIn PDF document text
    • http://zevatirupura.pbworks.com/w/file/fetch/144626178/zodupexojolozomudem.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_off0000ea99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 5016 bytes
SHA-256: 7a5d114e119bb6f5cd11f77f6273805982caa9a0daf5c3f9e4d4efca4168f496
font_01_sfnt_off0000fbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 10852 bytes
SHA-256: 382c8673832206fc8f261cae4998cb1669803ef41521b3bb5ca142c878b9b53a