Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ae9b3b9d763587…

MALICIOUS

PDF

72.3 KB Created: 2021-10-02 11:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c2ba1e967c308840f080c084fa68c9f5 SHA-1: d443de8bc070ae54db3679f4d45d0c5f720669af SHA-256: 95ae9b3b9d7635879adff23e02b6127744a6f456fa79e793e3f519c3b7216f4f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URIs, many hosted on potentially disposable domains, suggest a link farm or phishing lure designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://vandervalk.reviews/app/webroot/files/userfiles/files/kamixopadudabowixob.pdf In PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/bugomidorex.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/94345544833.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf65187a3a---riwobigesutas.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/tivasikutamapimemuker.pdfIn PDF document text
    • http://pvvc.cz/files/45944344840.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/65806178089.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/xubugavumadogokipazojuzin.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/jinapuxevusika.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/78633079132.pdfIn PDF document text
    • http://juncheng.tw/upload/files/84187590266.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/36815045319.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/niferurajofuxawepejod.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/bekonod.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/saripodowupononezanulix.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/fozalipidof.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/37722436966.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/lomubo.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/50270939276.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/78556963683.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/nininupemipeniz.pdfIn PDF document text
    • http://taociren.com/upload/file/210914025111445376g9c1sbv2sn26.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/49202037343.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/givoritusikifiradivije.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/51372e434a721dc5f155e43c4b492465/63407148280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mount+airy+primary+and+infant+schoolPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB545 16928 bytes
SHA-256: 6876f04b9748d43e1caf999a98cf6849189b1075ed9e833689b2e664c2c2d9f9
font_01_sfnt_off0000dfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F4 10960 bytes
SHA-256: 0e0bd075847541578c8c749255d45bb8c45985e22a6e55425f9c1b2e7414148a