Malicious PDF — malware analysis report

Static analysis result for SHA-256 4026bda3ac4c1cfe…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 05:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d015b95b0bf7c339fe5bb935d84d0ed7 SHA-1: 3ff37b225a4f32caabb8d6e73b521beb61a5e47d SHA-256: 4026bda3ac4c1cfe79fd32e01f3be9bc61407d0524e635e1bf556295fd41a6c8
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. This script likely redirects the user to external URLs, as indicated by the numerous external URI findings and the 'link farm' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9716

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 https://philabc.ru/uplcv?utm_term=papa%27s+freezeria+to+go+unblocked PDF link annotation
    • http://www.kingsmen-cmti.com/upload/files/53675705002.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/vupeguwifokoginututagan.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/60358823723.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/79476153233.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/rokimurid.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/22341121455.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/xilapesanesikuv.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109081252402801.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/gofuvekelidim.pdfIn PDF document text
    • http://rococosofa.com/files/files/92880164372.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/50046675290.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/kinebogoxedizekobopog.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/73549188971.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210913_73D5446DC864A9BE.pdfIn PDF document text
    • http://domario.ru/userfiles/file/37297553709.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/vejanonaxulerisimamurapo.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/gudotejasivusero.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/vavorewirikizafokoxi.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/lirakidazinimajumija.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lunixasuf.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210902020321.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/duwekexedabi.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/jogaf.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/jasizuduvakarik.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/xagov.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/xumaruvibeduwilukuja.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/4926682622.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://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_off0000dae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE7 11224 bytes
SHA-256: 84a4d5060bf87886a09afeb35473d17539c0e7f4cbbd29e312c8f6beae246f02
font_01_sfnt_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 18088 bytes
SHA-256: 36d8c56df0a72c860bf51ec1dac1c0ed899991b1490e2f7d31ef588661ab8499