Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dc41e6b41fcd0e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 12:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f3dd55bc83933e327f5e87f8bf36b90e SHA-1: 86e53b19894871f5e447a9f6cd49821390254db2 SHA-256: a4dc41e6b41fcd0e98a80db3eabb8f071e453b3c6aad697f4831eb28afa0efcb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the link farm heuristic further support that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://smidgel.ru/uplcv?utm_term=zenonia+5+mod+apk+offline+unlimited+zen PDF link annotation
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135c0986629c---94747644801.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/puxevegisijifekaxamumi.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/93284871747.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132c215703ef---mabimopuwixinalitazulopaz.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630492233.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/96930425150.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/35040220227.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/derenimuxenuwotetivewi.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/64369616412.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/35672475960.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/42722396086.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/budujonijetew.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/pegikitejizune.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210909064912507.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/66481770706.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/xikixurazanine.pdfIn PDF document text
    • http://idroter.org/userfiles/files/64883289345.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/57e3c779feaf1c2fe583a28c2808df2f/nupusomaj.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/911269774.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_off0000d16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16E 17156 bytes
SHA-256: 418cf4093abc0423f9e0b6ce437ae7f945294e6b1826e196e36b453d25e65e7b
font_01_sfnt_off0000fe08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE08 10740 bytes
SHA-256: 0ff0f2967a4ed4a1e6f8c41121d66e5eb5b3f34fcfc633a4614520705ef361d2
font_02_sfnt_off000116c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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