Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85470beb9de8bab…

MALICIOUS

PDF

83.6 KB Created: 2021-09-23 12:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 945fe68d1b6e508769c2609be0861d03 SHA-1: 2f4b40346c484838d4d0264ebbe0b7601b5aea94 SHA-256: c85470beb9de8bab7b2a448c02a044addf24c172e8d0a7ced86e6cae2ebefc7d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used for phishing or distributing further malware. The PDF structure and embedded content suggest it's designed to redirect users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://medvor.ru/uplcv?utm_term=dragon+ball+z+kai+stream+free PDF link annotation
    • http://viettelhaiphong.me/data/dulieu/files/dipevuronapukefonotis.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/54641785102.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/jirije.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/duzevuraso.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/20470801359.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/52749846791.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/ladoxuxukafokuwa.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/pefegisakala.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/nijosoga.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/70029645556.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/xagoluxepix.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db13b8b726---pasolafulikixerof.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613659b653793---40513332781.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/gadejitejusubarumofexit.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/11332477847.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109050552398988.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/gusinusewozokamo.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/2104102047.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/74794676790.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210916060606_1658334043.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_off0000e21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21E 17528 bytes
SHA-256: 83012ba5ad85540819688b08c54254ab9e655ea88ce441b007f5ae0b77cb151c
font_01_sfnt_off00010fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E2 10852 bytes
SHA-256: 7a9e96bd8423cf5b1a1612e7e54f650181fa2607ac53f72bcefc78ff65d41965

Open this report in the interactive analyzer, or submit your own file for analysis.