Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6e685d151727b9…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 12:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b00a047f7c6de0b4d6e9494ff5df906e SHA-1: 9e59e326704dca465ba36cf658cbbf43a4b5c15a SHA-256: ba6e685d151727b90f31547a68917996856264bc84c11e33e646fad8a4cd3cb1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious files, and heuristic analysis indicates it is part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ankurgroups.com/userfiles/file/36713903968.pdf In PDF document text
    • http://faurau.com/luodan/images/userfiles/file/64843469844.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/buralobigu.pdfIn PDF document text
    • https://beautydent.hu/editor_up/masewetatajo.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/jivaxefib.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090505152673499.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/51434647069.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/borifadubefopapew.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210906131727.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/xufewifel.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/60248099274.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/89925169197.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/vogekodikupijafukiru.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/86699405379.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///79764254683.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/96965945944.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/wegazefaxatababutobite.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/f782ef8187258fa6784ddaf854e99e55/51044931452.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/vuwugawonatotelaj.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/wawedosekakaxepire.pdfIn PDF document text
    • http://4bx.pl/public/file/wupunakinukozileg.pdfIn PDF document text
    • http://husplaza.hu/editor_up/dajegetojap.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/80758065139.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/8843932606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=30+days+to+a+more+powerful+vocabulary+pdf+drivePDF 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_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 17228 bytes
SHA-256: 42fe1d52b58d4f6b0cff0c9ae5ac26f300ef44930a526f4ceba1d2ecbbbea57f
font_01_sfnt_off00011157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11157 11380 bytes
SHA-256: 715c1a620ecedf4e00e113f91ebaa1da206959df4e85dc1708db77bba4b799d7
font_02_sfnt_off00012c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1