Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b2d83b676b2261…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 07:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3314aec9fbb8d7ed3d56b9b91fa79008 SHA-1: ff7e0135698ed22fe86a8a660490fed963ebab1b SHA-256: e5b2d83b676b22613986110adf2873b1dc53a87834d2522d5b886f58a7770a67
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF redirects to a large number of distinct hosts, suggesting a link farm designed to obscure the ultimate destination or distribute various payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://2017.letnifestiwal.pl/ckfinder/userfiles/files/raxikofunenete.pdf In PDF document text
    • https://viboot.com/ckfinder/userfiles/files/ruzalupulukapuwikunirosu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614ea1a2924fd---62521192747.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/vasuti.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/godajulajugofe.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/52977614478.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/48272140395.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/48717047239.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/dofidorazo.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/495894892.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/varamapudodivuw.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109041415024884.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/kajisuzelugujagubida.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/8140869740.pdfIn PDF document text
    • http://vanhacollection.com/images/files/kikarebirokupil.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/tapepotibakefu.pdfIn PDF document text
    • https://slotpt2.com/contents/files/76178459848.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/3852517719.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/metuxumazesoludaxafop.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/19109509375.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/imbneruck1ft3jdq2eqemcu776/85380561646.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/zufilijokozakulaj.pdfIn PDF document text
    • http://goldmustang.com/files/files/7620391911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+take+scrolling+screenshot+on+androidPDF 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_off0000b0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CD 17820 bytes
SHA-256: f1ac1f10b00f0fb0b51a5fd839cf111d10810e811e3ae8a65ff9eb86e12aaaab
font_01_sfnt_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 10820 bytes
SHA-256: 55d1c6ffedbb3b6fbab48f71a4fae31252dd242abeea112dafedcc3c1669d416
font_02_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1