Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb41ade30d108bde…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 16:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b79a311978190ae1d01f469c6f3ceed9 SHA-1: 9506a9ec4bc0c5236a3ac36bc8f23464c6d20973 SHA-256: eb41ade30d108bde5f531c649ab34095490fec7cc66a4cdeea942d80c26e5692
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, 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 external URIs and the link farm heuristic suggest the primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=house+of+fun+vip PDF link annotation
    • http://imoroz.by/upload/file/xexexisumodavukapoluvamu.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/60076911515.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614803f3bfb13---nufurimigarorobidebewurat.pdfIn PDF document text
    • http://le383.com/uploads/files/wugufudesosorumo.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/wagolinoxakezem.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/nuravikanazilofuxivuz.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/xulekevitiz.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/28240350349.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/5171252656.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/xatizagibeganiveg.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/98459684989.pdfIn PDF document text
    • http://pjteam.hu/uploads/fuwipupijevesuluwixedotip.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89914097164.pdfIn PDF document text
    • http://araratmebel.ru/img/file/6367125884.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/nekabixumemo.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/15750990435.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357cc5bc0e5---golij.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/93201453420.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/20664109884.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/bubevakibasareraxudir.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/gagulonowikosa.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/49471409169.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/66859993508.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://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_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 18264 bytes
SHA-256: 03c0b5adcb809ce21323d2d343f83b6be465d06aab5169b1729d9638eb965687
font_02_sfnt_off0001212e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212E 10104 bytes
SHA-256: e334088bddaa590be91443b3dcb2e71550a8bb55555cacff8f657b7974036670

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