Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1e6aa2c4ba2a05…

MALICIOUS

PDF

88.3 KB Created: 2021-09-13 21:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 80cb048d46d407080591a24a6385ee41 SHA-1: 0cb9c9b69124a6763785934f7938ed7a26e79af6 SHA-256: 6b1e6aa2c4ba2a0578792a2bbd6c61bf14c5bb736e1fb684f7b57b89d797916d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://powermailer.in/userfiles/file/velexuwilur.pdf In PDF document text
    • http://kaiyudachem.com/filespath/files/20210911122450.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaeea355bb---siguzatufupi.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/depewidariwatij.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/putox.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/zidusodedesaza.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/xinozujagofa.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/rusibiferajimasibixasiv.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/tidimilomexorilazajuvemu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce2b341f59---rokugoniseruzivejilobe.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/dobamanav.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/pepekurukujuwazofep.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/41714138107.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/tafegarumejozita.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/pijarevujimotebuzuditobu.pdfIn PDF document text
    • http://bibikid.ru/upload/71792916447.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/xefumimalusinanu.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/fulekowomujuvuzakenu.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/36374020304.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/35140771569.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/59584221943.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/76668774100.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/98802936685.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/13534478972.pdfIn PDF document text
    • http://skomi.ru/img/files/file/31686853377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=themes+download+for+android+phonePDF 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_off0000f444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 10712 bytes
SHA-256: e8be5fc430f916aa2dfd8053af1e10f08d1a2c0955865d721f5ccbd96b62678c
font_01_sfnt_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 17916 bytes
SHA-256: 504d34a71632ca1b576b627a350a1018debfd8a7a4d949cb5a959a781738e863
font_02_sfnt_off00013b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1