Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e6b1d62c2913e99…

MALICIOUS

PDF

86.4 KB Created: 2021-09-17 11:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4082583d346899e59ce3727547b00f1f SHA-1: cb422a6bdedb80cf28dcdb2b6b8fcd014f3133c5 SHA-256: 6e6b1d62c2913e9949adaf5b296fa624fc4c7372c0fcfcc0f8524cd56f945725
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://drafthe.ru/uplcv?utm_term=india+number+one+game+2020 PDF link annotation
    • http://fulns.com/uploadfile/fckedit/file/1631233592dZ4z.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/31687200817.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/kipavanelax.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/lepizivewazupebuje.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/25ea7fc358e9e1213b5517ccf10470af/sotemelekuzubuzetoje.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/surosesibimugiponon.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/1523971465.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/xafeniwiti.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/67977589135.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4726187473.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/nagitonejudoxedukedevalu.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a613e73df---97777058625.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/jodewikuga.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/bogonibunavasaworawi.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/32766952813.pdfIn PDF document text
    • http://antracit.topmebli.com/content/xuploadimages/file/33846565023.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/zupedux.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/55610703006.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/55180582249.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/sufajebefuluti.pdfIn PDF document text
    • http://banquat.com/userfiles/files/87893885660.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/81752559402.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/3289387083.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/lagawategowepokulux.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_off0000ebea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 18788 bytes
SHA-256: be8625d9247862d39251191c50ea96a2e5fbb33adf0198a27de6e6408d94a596
font_01_sfnt_off00011bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E9 10712 bytes
SHA-256: f2d2155d8855531e3793242cacf798929bfe2f072df20eb82b60c5eedca220dc