Malicious PDF — malware analysis report

Static analysis result for SHA-256 38717c91cb71fbbb…

MALICIOUS

PDF

47.8 KB Created: 2020-11-07 08:56:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: c84de159eb2ad5da4aae24de6c3ac029 SHA-1: 5452ac8dd5bb1b609b3838fd02048d35c69f50a5 SHA-256: 38717c91cb71fbbb495b33ba06157005ef3ab53d8dd83bf1a149eab2ff5f692c
134 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=forms+of+government+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370304/normal_5f8d2d065b928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418557/normal_5f9723c4cc582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407793/normal_5f94d6a9c3b71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5f9c213b9b996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406812/normal_5f9b24dbd9f30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422161/normal_5f99bb70979f6.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
    • https://napawun.files.wordpress.com/2020/11/geometry_5.8_special_right_triangles.pdfIn PDF document text
    • https://tibepitetuj.files.wordpress.com/2020/11/jetunobove.pdfIn PDF document text
    • https://gexevoj.files.wordpress.com/2020/11/use_apple_notes_on_android.pdfIn PDF document text
    • https://wumevom.files.wordpress.com/2020/11/suvomejepinigolona.pdfIn PDF document text
    • https://vadazigifexe.files.wordpress.com/2020/11/gopiv.pdfIn PDF document text
    • https://durilam.files.wordpress.com/2020/11/24241880596.pdfIn PDF document text
    • https://balapep.files.wordpress.com/2020/11/phoenix_project_types_of_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/247d039c-e3cb-44be-b90f-3f47bc15c1e0/a_castrato_is_a.pdfIn PDF document text
    • https://wefufepolo.files.wordpress.com/2020/11/numeros_reales_cuadro_sinoptico.pdfIn PDF document text
    • https://dexizow.files.wordpress.com/2020/11/piramide_triangular_para_armar.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_off00006dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC7 5124 bytes
SHA-256: ed42577ab1f91160795b2bdb61d0e9bc657b29614bbd12e9a483702fccda0524
font_01_sfnt_off00007f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F23 10836 bytes
SHA-256: 28abb810784767bc7f1ecff59b194f2a3e3401eedfe9b9eadf254b8e48c714f8
font_02_sfnt_off0000a406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA406 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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