Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e667185422b9f0b…

MALICIOUS

PDF

87.1 KB Created: 2021-09-14 12:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c855fdc34bc346fd3114eb19e90e83e SHA-1: a36b14e28a66b8a39d27fc6802c260a317dd38bc SHA-256: 6e667185422b9f0bd7130e108f3e696a7f111b6abeea83d3a9234cc853267dbe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms or disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or lead users to malicious content. The document's structure and URL distribution align with a spearphishing attachment designed to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://behtarinekhodetbash.com/files/files/75378729906.pdf In PDF document text
    • http://www.andreapondika.cz/file/99620291093.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/vekuvigelasuras.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/tasidigo.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/totozulowijebopojevado.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/16211469775.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210902042022_dbtccf.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613656b23fcfd---24206181526.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/gatinijap.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/1130794182.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/86443956474.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/j9e7st3l4nrfo0opg6mlcbk603/nulevanobusojepowip.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/75969617885.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/33421281096.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/30357003102.pdfIn PDF document text
    • https://alkoplast.rs/files/94185721925.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/80895825779.pdfIn PDF document text
    • https://vestol.bg/files/file/22011297729.pdfIn PDF document text
    • http://evola.it/userfiles/files/sadepigasiv.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/warudimobu.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/98451273895.pdfIn PDF document text
    • https://protrialse.eu/files/files/kupitarisenikulej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=sword+souls+hackedPDF 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_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 17808 bytes
SHA-256: eb7bd078db2e57db03cfddc409dc6657cb727bbd95385409596b8e000c3802aa
font_01_sfnt_off00011eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C3 10524 bytes
SHA-256: d5bfc0ea0ea7b99f55d2bf8bf5374cca3b23d9e1c1fded19a7e806200e7b60c9

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