Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9ac7c17075cac6…

MALICIOUS

PDF

73.3 KB Created: 2021-09-10 19:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6fa4f3a20f4f0fbae3d7aadec6a3b102 SHA-1: 48d6a418705a07cd9c97dc63ab7d6c90a0bb236e SHA-256: ce9ac7c17075cac66b8910f59a86c329cdd2bb1d7fc9479ad8ef9f8e67c824af
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://gorillatheory.com/admin/upload/file/50412697144.pdf In PDF document text
    • https://angkagenap.com/contents/files/65576056166.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/bulixafi.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/mimumada.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/54292208291.pdfIn PDF document text
    • http://susutour.com/userfile/file/jupimilobuvoragewavunirod.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/44669984857.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/40616836229.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/sexaroxasululam.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/zusanarirebolirapaxo.pdfIn PDF document text
    • http://bdsductri.com/upload/files/65715748029.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/vupusewesipozedidezekexer.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/48819718365.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/63439005174.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/telekuwe.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/56634497923.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/99240124538.pdfIn PDF document text
    • http://husplaza.hu/editor_up/66978566349.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d326816f7---85975286639.pdfIn PDF document text
    • https://fasleh.net/Files/files/wabifatagufanat.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/30826976505.pdfIn PDF document text
    • http://kco.su/userfiles/file/3096898538.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/tatoxinesa.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2e191c459323b302650e3f49ce9e0a18/53717984922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+hunger+games+mockingjay+part+2+summaryPDF 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_off0000b846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB846 11292 bytes
SHA-256: 03d8f32e3a7efab512cbda37eab4b7f93796e1438fc08ed376b8e3e20af09682
font_01_sfnt_off0000d2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B4 17268 bytes
SHA-256: e49ad1f61823d99a564baac9e20db05eb76923257e2fa483615eac74c93956aa
font_02_sfnt_off0000ff2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1