Malicious PDF — malware analysis report

Static analysis result for SHA-256 318ebeccc26bfd2a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 09:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3284626c5b63abfa4a7c62bee4e9f24 SHA-1: 7e85ee3647043b663a0cf53a47c5ef1ce296e27b SHA-256: 318ebeccc26bfd2a97942b62255dd12f73edfe435b07e84ac342fca1bd4f5ceb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://asja.ua/userfiles/file/mulokezisalinujeluvubobu.pdf In PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210903_1DD372FEA7AA5328.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/54992297185.pdfIn PDF document text
    • http://darec.sk/files/files/bafimawarodelemu.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/zuwovedipixeba.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/xizesuredojif.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a860dbc7f---jowatugujimofin.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/lowiro.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/29560507075.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/nuned.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091222255950.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/78564412770.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109080125192873.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/71168460344.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/431440740.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/nipagasedazodarozu.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/73539328235.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/bolunufidapevak.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/gavejedoveposelafafage.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/68175336689.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/xarolofafuva.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/turolubaniwera.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/talepevusojenedarogulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=league+of+war+mod+apkPDF 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_off0000d689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 10568 bytes
SHA-256: 864e88b3748f52ab23c3c9a2479099f3b5419277616160ba6a65c37594ec252f
font_02_sfnt_off00010696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10696 17016 bytes
SHA-256: b664133d47e5d924524052806aee50bedd30bbcb7f35b570485ec46e7c77e24d