Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f70488c8aca0e2f…

MALICIOUS

PDF

76.3 KB Created: 2021-09-09 23:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f20aa9d0d8416c9f6b6a1e0d4a124e66 SHA-1: 06bbd84c6db0e5e7d96ac3b1f5b935d9a78b7ca2 SHA-256: 6f70488c8aca0e2fa7689e5b3d2492c1864b371fed7ae0e07c6ef65278a01af8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users to potentially malicious content or downloads. The document body is heavily obfuscated and contains no readable text, suggesting it is designed to be a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://maria-galland.ru/files/file/neneje.pdf In PDF document text
    • http://lor-rostov.su/userfiles/files/zirixebefaxuvebapevunox.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/setakegifuxepixixe.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/49554289213.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210906_26DA659122065C55.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/185922743.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/ninuwetepisovirexop.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/xokagukitasow.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/dalutiki.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109012306502285.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/63685602786.pdfIn PDF document text
    • http://gespk.com/userfiles/file/vuxugifujepefikolorodabe.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/kizunefudegebaximanu.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/bebabazupenatujavula.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/milarodubefafiwudunijiwoz.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/dizulifirunodil.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/55512535429.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/numakebuluzo.pdfIn PDF document text
    • http://ymmicro.com/files/files/zupigowosunilafaj.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395d3f9efbc---torexesemefosi.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/ruwudurob.pdfIn PDF document text
    • http://fruitsad.pl/images/file/nuvemaforodojadavi.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/babalalodeji.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/pudizenijiwefimuvezinex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sleeping+beauties+2017+watch+onlinePDF 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_off0000c608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1A 16796 bytes
SHA-256: c199c3e0a00c469a4bc56ebdfcd6b5d09d1b34844f2c0144186e52be60dff0b4
font_02_sfnt_off00010981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 11300 bytes
SHA-256: dcb76d4a0b295d621671f88772ba6d4d9e2e276988b7da38f18f41ad64671536