Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef505afb92f47fa…

MALICIOUS

PDF

57.0 KB Created: 2020-10-08 06:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a4561157e007b2bf3ccbf3b42415263e SHA-1: 237f530f9afda27a6d98cd25e386419a80dce97c SHA-256: 6ef505afb92f47fab1902e261e8bed368c1f002a853ce713dc155a6e8ca92d8f
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://ggtraff.ru/strik?keyword=gentlemen+prefer+blondes+%25281953%2529+online+sa+prevodom In PDF document text
    • http://tewefaj.weenip.org.uk/uploads/1/3/1/6/131607239/2abde23d51ae4cf.pdfIn PDF document text
    • http://files.shcdc.net/uploads/1/3/2/6/132680813/9d0405900257.pdfIn PDF document text
    • http://firizoxit.mjbclinics.com/uploads/1/3/0/9/130969407/xumokave-tusenelirumo.pdfIn PDF document text
    • http://files.eleanorneffpowell.com/uploads/1/3/2/3/132302982/vudevinazofeluwigeb.pdfIn PDF document text
    • http://files.eglise-protestante-terresdumilieu.fr/uploads/1/3/1/4/131454791/sebibuxuvipon-gipud-vametan-xokileki.pdfIn PDF document text
    • https://site-1043976.mozfiles.com/files/1043976/jifusexusepog.pdfIn PDF document text
    • https://site-1044197.mozfiles.com/files/1044197/kenenora.pdfIn PDF document text
    • https://site-1039465.mozfiles.com/files/1039465/62581483886.pdfIn PDF document text
    • https://site-1037911.mozfiles.com/files/1037911/29315029508.pdfIn PDF document text
    • https://site-1036851.mozfiles.com/files/1036851/29717760979.pdfIn PDF document text
    • https://site-1039465.mozfiles.com/files/1039465/44052476129.pdfIn PDF document text
    • https://site-1036799.mozfiles.com/files/1036799/konawunefigi.pdfIn PDF document text
    • https://site-1041591.mozfiles.com/files/1041591/mirusolotodowoz.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/9a4ade08-143e-4721-9ced-937ee685c3c9/petizififepusefofojaset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/697902c5-240c-4721-a0f2-0738d2361d84/xubofujose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b89babd8-0e20-4bf8-b7e2-b1eb965f25d1/65776779471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/291647a0-655f-4a5b-87b4-1d7701b52fb6/taranuvajirisexuso.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000b370.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB370 20800 bytes
SHA-256: 0371e40c5058e6f7e1aadc54f752dca59ae2a15b97e3a43c70509d469a79d5cd
font_00_sfnt_off00007021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7021 6068 bytes
SHA-256: a69568e24e3d29b8c7eb879ac10250e2c74dd7a262658cf34501dce3accda0cd
font_01_sfnt_off000084c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C7 14936 bytes
SHA-256: 91f36dbdbbdd580b1d91352b15536df8aab41bd9837c741f71052d99b42ee0a8

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