Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a53f8755027a75…

MALICIOUS

PDF

77.3 KB Created: 2021-10-14 05:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b6368ef63161d079e150eda87dbe72b9 SHA-1: b02ebed5e3c8b952236fa7a6385458d57e285cd4 SHA-256: 25a53f8755027a75657ec06a650893cb35713fe7e2b06e65e7168f5ba348fe9e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the document is designed as a link farm, likely to distribute malicious content or phish for credentials. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://andrenickels.de/ckfinder/userfiles/files/23177235084.pdf In PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20211012165842.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210921050748.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/99647373365.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/tulaki.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631953587_1.pdfIn PDF document text
    • https://dpdpunjabi.myskoolapp.com/FCKeditor/FCKimgUpload/file/63731451402.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/9912de1a596dd871234a6d149c48b5d0/49056385975.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/45393018422.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/57826899393.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/nitubugekisixe.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/32768922251.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/73890327450.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/sisiranojofabemuviveken.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/nakofujeg.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/15693948402.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/11668535157.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/32072798064.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/60018231831.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/83800228785.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/32801125708.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/KGDyd8lM0uI/uplcv?utm_term=why+is+possessive+pronoun+importantPDF 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_off0000c71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71E 10744 bytes
SHA-256: 5ec65fbcc801dcccb4ff64bc95ec508045b70d395821b1a52173efa1180f98c5
font_01_sfnt_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 18648 bytes
SHA-256: 39ea8fa7870e09b1babc3de67f013f6dc4d5a391151b89a3092e57285ae1b2db
font_02_sfnt_off00010f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.