Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea95869395035d3…

MALICIOUS

PDF

72.4 KB Created: 2021-09-26 06:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 25ffe15db0de9c6e0834d140dbbc4716 SHA-1: 235e98d92dc9f54ee5d48e06a408a70daa43a6e2 SHA-256: 6ea95869395035d3d37fd6e213970e19d93d0bb4cce4951808ceaec9226982b3
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. It contains numerous external URIs, many pointing to PDF files on disposable or unknown-reputation domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the presence of external links indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://geodavidepini.it/userfiles/files/58559348014.pdf In PDF document text
    • http://eko-gospodarstwo.eu/files/file/moliwatogivepeluzoxa.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/73961592087.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/zenukisezevagasixi.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/41144817861.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lonusumugesusa.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210920_014858.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/duxufutuxu.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131d6c1620a6---9709717781.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/natoturosikaginatovubes.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/jurab.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/lubasedojogufigi.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/667473675.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/70018633986.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/50302042443.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/92940984600.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/92750117428.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/26447680626.pdfIn PDF document text
    • https://penzehir.com/dorceiys/ckfinder/userfiles/files/bobowifupusas.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/werapakabilikosibuzibekor.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/58537440448.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/bebemozumujugubu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/fbf36880a1f74755c901e1fb2d0a1ba6/totogedigibugixukanolepav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=legendary+moba+offline+mod+apkPDF 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_off0000b4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF0 18280 bytes
SHA-256: 55dcc7a0001f2027a8d28bc8d18c92eafb4fda560d98b6ca7e11e97f29494b52
font_02_sfnt_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 10880 bytes
SHA-256: 831a77c0f295d977d805af116b4c6008896eb7224d0129f0d47ee7bfe7bffdb8