Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4e7e76285aa7fb…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 01:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1565d425a95d6a27c310b1bb9f68a833 SHA-1: b3acb27146f89f58d6b75ef6efb89ec5594a70d8 SHA-256: ef4e7e76285aa7fba4ffbbd75719a58440e4c4d6695bc12d0d3d6ed15ab66c25
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF contains embedded JavaScript and numerous external URLs, indicating it is designed to redirect users to malicious content or download further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JS points to T1059.007, and the numerous external links suggest T1071.001, with the overall delivery method likely being T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=gta+san+andreas+gta+v+graphics+mod PDF link annotation
    • https://drlanda.hu/user/file/85013255466.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/51804360350.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/13823164137.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132553d4e319---98967493068.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/sinurozovesi.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/24958084613.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/retoxezudili.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/kigesifepoxazujewono.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/buzibe.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/10850236031.pdfIn PDF document text
    • http://thepducphat.com/upload/files/97523229229.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/51832608904.pdfIn PDF document text
    • https://kawanmto.info/contents/files/datepif.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/68022472830.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/31235980033.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/jopin.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3q68d4e6mhj4i7bcv3d817o134/wanolofezuxilagusegado.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/manotidigovitomiri.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/67632058497.pdfIn PDF document text
    • http://zzquansu.cn/d/files/97683535689.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/runokujabuwuv.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/jesabilalamifolukepetaj.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/59821093686.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/2181772529.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_off0000dbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 17388 bytes
SHA-256: 017a23de569ad260e9496b9841c25f0445089e1b24596a320473d6bb3136df9e
font_02_sfnt_off000120b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B7 11020 bytes
SHA-256: d9b2c4c6a6fbbdafeb2ea11f87a6aace0cb82c6bcfb640fda6f862922afc7e9f