Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d8829c173b2828…

MALICIOUS

PDF

73.2 KB Created: 2021-09-09 03:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3b6a078cf79854d12b245c20dab2b65 SHA-1: d41a94b0a953fbd5f485d2e4e12e95cea5bf60c2 SHA-256: e2d8829c173b28282d371d41374fab077cf07ed1b4db92ecc6867698a3aaedcf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests a link farm designed to host numerous malicious or phishing documents. The ML classifier and ClamAV detection confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/ralanomow.pdf In PDF document text
    • http://xenangheli.vn/public/files/senigowopixedekezimafise.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/11591047011.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/radut.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/78617718117.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/duzolamaraseworimobobiwuf.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/59013976996.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/56599721411.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/gufebidaxalakizorevurub.pdfIn PDF document text
    • https://lordoptika.hu/files/files/88950922846.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/mipeg.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/93121794592.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/pewozabevuwidu.pdfIn PDF document text
    • http://maksimetall.ru/files/43199994766.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/82904297057.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/mowibibametediwefulov.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/rixezujavij.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/felovezogopopivazizusa.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/xerozibavaxo.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/31953934477.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354b8c664f9---jejeketugizixuvibo.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/81127160329.pdfIn PDF document text
    • https://tdfstore.it/file/felab.pdfIn PDF document text
    • http://rideco.hu/upload/file/timetof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=turbo+vpn+vip+mod+apk+free+downloadPDF 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_off0000b92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92B 16980 bytes
SHA-256: 73429a74f5ff5997cf807fe6e40ababb433aeb719143c86b9286b3f89167ff0a
font_01_sfnt_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 10840 bytes
SHA-256: b249a8835bb94106bb6092bec4324e1c0a5c355aa307dcba1773d9d376763c41
font_02_sfnt_off0000fd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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