Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db4fc4ce70081b9…

MALICIOUS

PDF

84.3 KB Created: 2021-09-09 10:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 727a0f78f4506ec2aec3fc09e6b15551 SHA-1: 8b497d48b9d7acda6edfbd2fcd17c91b06b59a08 SHA-256: 2db4fc4ce70081b99300a15a45c90b39a26a95c74bb7ee509971eb403ffe00b2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the PDF is part of a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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 https://queure.ru/uplcv?utm_term=mbit+mod+apk+download+without+watermark PDF link annotation
    • http://uralcomservis.ru/crn_fls/crn_files/losezubinezuxup.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/mesajatutiwag.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/wobotupujofatepar.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/97219552358.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/dafasoxagixawenalelonag.pdfIn PDF document text
    • http://calisnt.com/uploads/files/ludofobosasitujixev.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210903101653.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/31709615141.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/18176315881.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/ligoluduxubifosole.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134010492a14---25031970104.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/pawoxadivowakilate.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/39887448979.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/julugumiwemibula.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/mapozovufuwemo.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/92827097595.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/93137339524.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/lafoziwikekemawilolu.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/zibod.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/83271115053.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/83125813480.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/xerapudigenilozaju.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161300af38f965---61911887042.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/92341137966.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b8c086bb13ba312a6cb2130765fb16a2/bexeberowulewema.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/71648361167.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/volirizowifabunoroz.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_off0000e181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 10900 bytes
SHA-256: cda334b8e5a773a2958b7e67b8dc8bac354c326133e4a13eb63de2d2de786566
font_02_sfnt_off00011265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11265 18472 bytes
SHA-256: ca5155eaf616c48c7eceb4da49997c91f81d8ad53d93ec84e4a23f9648ec0d1f