Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e5eb510b14cd52…

MALICIOUS

PDF

75.3 KB Created: 2021-03-04 13:09:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ef5bc75b52d8b64a347714e50137bffb SHA-1: 34fc7e9b3c80835e2ee4461fda09fddcf3177c69 SHA-256: 11e5eb510b14cd5221f2d821e79b31c029f487baa5b175dbec40cf74d248a803
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to document formatting, directing users to potentially malicious URLs like 'https://gimoguvi.ru/wb?keyword=cuales%20son%20las%20tecnicas%20de%20redaccion%20coherencia%20y%20concordancia'. This suggests a phishing or scam attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/wb?keyword=cuales%20son%20las%20tecnicas%20de%20redaccion%20coherencia%20y%20concordancia PDF link annotation
    • https://rezopagukivuru.weebly.com/uploads/1/3/5/3/135307961/guzalidijasozusamo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490129/normal_5fda76ccec451.pdfIn PDF document text
    • https://dowusezawidi.weebly.com/uploads/1/3/3/9/133997386/1ff71d.pdfIn PDF document text
    • https://gidupewurugi.weebly.com/uploads/1/3/1/6/131637306/bunegazeref-segiwabetit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483873/normal_5ff4dbebae7f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367941/normal_600f2dfb3f269.pdfIn PDF document text
    • http://xplaintome.ru/insider_reporting_osc4t5xu.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/zodoxubixetojef.pdfIn PDF document text
    • https://mefupajudeto.weebly.com/uploads/1/3/4/8/134883840/nikaguwuwugimu.pdfIn PDF document text
    • http://heliusdesign.ru/against_all_odds_torrentqxfst.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/autocar_india_magazine_2019_free.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/fisagasa.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/zalurigibaged.pdfIn PDF document text
    • http://girofili.myartsonline.com/is_nikon_d3400_full_frame.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/weather_report_live_news.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_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 5032 bytes
SHA-256: 6ed1d8ac28489b317b68efe4afd99cbaf1d8ee4e963b261997d737a0672a34e3
font_01_sfnt_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 11348 bytes
SHA-256: 8701ef81d2ddf78dbb6874862a1bd408fa866799990d2aa01b34180b58eb323f

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