Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe38719a6c98cba5…

MALICIOUS

PDF

56.2 KB Created: 2020-10-04 23:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 11f705393bb09fd56a4962198083bbef SHA-1: 7da67cf471ac347f262005778e807873bfa5af65 SHA-256: fe38719a6c98cba54217018d4a1a4914571aa32d193bceed5a528dfb61e3213c
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=exercicios+problemas+ambientais+geog In PDF document text
    • http://files.nabclean.com.au/uploads/1/3/2/6/132681157/lekisag.pdfIn PDF document text
    • http://files.kalabeautyworthing.co.uk/uploads/1/3/0/8/130874244/gidoluza.pdfIn PDF document text
    • http://riziga.lovelocalnashville.com/uploads/1/3/0/9/130969018/3365685.pdfIn PDF document text
    • http://files.jcspoolservicetx.com/uploads/1/3/1/3/131397974/3730383889d36.pdfIn PDF document text
    • http://vinedov.timsuteachingportfolio.com/uploads/1/3/0/8/130874218/54eb196c.pdfIn PDF document text
    • http://xedewis.daeodain.com/uploads/1/3/1/3/131380042/3745831.pdfIn PDF document text
    • http://zejeb.darkerberrygirls.org/uploads/1/3/1/3/131379554/makifosu_biwavo_joziwaliji_ragaluripolonos.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/496ff1d6-ee23-478b-bbe6-e4a6c41a4f79/89662550829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de49ba5-fefa-4d67-95aa-a91ce5d2c6a6/45223883999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e77a5d2-edb1-4c2a-b824-2f204ce52c81/17781974710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3725865e-a617-41ab-a158-19650cdc0b83/xugapubigoninuvizovavazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f933b33-f0c7-4abd-8d56-6088bd8df145/nexilageliwonikirere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5309dd19-f743-4865-98ad-a43c881cd5e8/9558903013.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_off00009e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E4C 5420 bytes
SHA-256: 13b5f7d4a47bb3332e0acfa099b17c00b2d8c0f8c20f24535f6caafc37eb2810
font_01_sfnt_off0000b0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A7 10292 bytes
SHA-256: 1b4dd4d038ede67bc58fcece30a54d5ccc8a7e07d4287d0c86b800295aa33123

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