Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a232106a9bb144…

MALICIOUS

PDF

78.9 KB Created: 2021-09-13 01:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea78ca0c1ac38b18c67d8e49f8a027aa SHA-1: f4b15a43e7cb35cf89f201793807d003eabf55b8 SHA-256: c2a232106a9bb14408f2245d3829f5b6e4e6a81c7515b4b75eb8af1fb9616b29
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to distribute malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the malicious intent through a large number of links on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/70976855464.pdf In PDF document text
    • http://drxzhang.com/userfiles/file/77143396128.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/83190404880.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/nepexijaxubofiginaxapa.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/2097276253.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/laguvoj.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/kagopubuvukuzanobawo.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/90482099221.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/39764110355.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/lemiporizir.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6d94df702---firesulig.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/jaripeke.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/54309092499.pdfIn PDF document text
    • http://lulanjina.net/upload/files/banuvonodogefifa.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/tuduvixude.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f529d8c440---zareta.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210902040326899.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/75772639860.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/7037721009.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/buvopunepitadugizixenufam.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/682916836.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/95518490944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=talking+tom+gold+run+hack+mod+apk+downloadPDF 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_off0000d055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD055 17176 bytes
SHA-256: 391397b149460d2d8bd46d5f943edc366919871a49ea3cc9aa36c0349c5a6957
font_01_sfnt_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 10900 bytes
SHA-256: 7a5d08cc95ace60faf6a71aca4be1e0cf667ac0f75e8e570bded3fc86f63bc6b
font_02_sfnt_off000115af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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