Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f6e69c79145c58…

MALICIOUS

PDF

75.6 KB Created: 2021-09-18 17:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21d56857b4a2ca115a9738604d4dc692 SHA-1: 28a85d59a3c9391991055268929b31455bc9c87f SHA-256: f1f6e69c79145c5860666be3666584c38b106343b618e5be77503c52c9ab74cb
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a likely attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting the use of disposable hosting and UTM term redirectors. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it may exploit PDF vulnerabilities or employ JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tabouligrill.com/ckfinder/userfiles/files/tedisegokipu.pdf In PDF document text
    • http://7sate.com/filespath/files/20210914190754.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/12289177547.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/95210511912.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/pukomidibefed.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/59618338041.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/legojeraxeniwagofarumak.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/tetajejutuburofubokolakot.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/23334155279.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/wutupir.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/78413529407.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/25844199668.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/93816767452.pdfIn PDF document text
    • http://vlajamo.cz/images/file/51614434020.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/juzelavubanig.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/83476377081.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/dojoligiduxivage.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/40985557820.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16305166591834737663.pdfIn PDF document text
    • http://isvpro.com/custom/files/lepugitig.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/divilukidunirez.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210913140904425.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/3775465383.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/wesamajelesogazidojepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=zombie+apocalypse+unblockedPDF 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_off0000bf51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD768 10888 bytes
SHA-256: 2d56b12fe936a246000c718116164b6bc0d2856219f24f864c4a739071e85e06
font_02_sfnt_off0000f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 18860 bytes
SHA-256: c50c0837ac7f91fbe9e761629163cb4f911b336d5f828ace4f966bef97eace40

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