Malicious PDF — malware analysis report

Static analysis result for SHA-256 634732e50c98f0c7…

MALICIOUS

PDF

78.5 KB Created: 2021-09-23 23:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea3573b51a35a574841060a567daec1c SHA-1: 53a6d43bcbe3c4478bd84a9f61b2e7e7e1815fb6 SHA-256: 634732e50c98f0c713092cf7f52396fe1050cec384fd77a6b98650fc26ff37b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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 https://philabc.ru/uplcv?utm_term=toefl+book+longman+pdf PDF link annotation
    • https://marblobaths.com/app/webroot/img/files/difadu.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/dopuwamizoluzun.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/vetusimuxenifutifajuvep.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/93846813516.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/1995592395.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/25938131539.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/53618396306.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/59088227195.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/nosixozejomuladusadel.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210905214923.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/35143571695.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/digazanamogotitelokunete.pdfIn PDF document text
    • https://oasis-travel.ro/files/xusolevesonado.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/10944835476.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/59651298334.pdfIn PDF document text
    • http://wenxuezj.com/images/File/tiromevagudukegojiwabozum.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/47685749915.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/sabizuniwovosamaro.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/22154345571.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/52464565147.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/78969730178.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/45747226083.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/91d88456d35da7b2817ecdaa855df8bd/duronemumebub.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/b5a11494572a299b65af7984f6dcf82a/ravibixu.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/kopok.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-12/20210912112246592242.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/25927008358.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/67031386707.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_off0000cd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD78 18180 bytes
SHA-256: ba1b30ec406c96d24e87121b1d42e30a4390274399f7ae1608c17f769c24fc19
font_01_sfnt_off0000fc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 10576 bytes
SHA-256: 73f3462b3a16e6c8dd1f6ca8369e3424a1b40e5e5b24b779d4652a2485f3fecf
font_02_sfnt_off0001143e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1