Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b1ef8ab4ef0a9d…

MALICIOUS

PDF

73.3 KB Created: 2021-09-24 04:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58011b504909d14cd814ef993e5840b3 SHA-1: 1d6b3bbf89fefb682acf18518e728fb546362d71 SHA-256: d7b1ef8ab4ef0a9df45cdb28bc0689765758f42631470485d51b259ab1bc3f06
154 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, suggesting it's designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting numerous links on disposable domains, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://chcial.ru/uplcv?utm_term=share+icloud+photos+with+android PDF link annotation
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/vulewed.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/bepedigikerunepot.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/42740924273.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/99529608733.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/19978165081.pdfIn PDF document text
    • https://tigapilar.com/upload/files/pupowotoviti.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/061530568371.pdfIn PDF document text
    • http://didopack.com/files/joviz.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/kalimunutubowafuku.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/68201520981.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/54082427479.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/51605523288.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/5708259612.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/99676278812.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/82654625620.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/4645675854.pdfPDF link annotation
    • http://visit-pune.com/userfiles/file/lepevufivu.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161423f3d2947c---jazavadowewixijotujute.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/12452668957.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/18666398066.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/9b79bbaed551809711389db7ff7d0df6/falajetijularanunarorap.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/mofexow.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-11/20210911191239223608.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/73184640014.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/71797010892.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/76331608300.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/xuwilexataxunef.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_off0000be1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1F 10872 bytes
SHA-256: 60b4981c929da47d47021859b9d0d5b0eada0214e7235c7f60985e10b69e0f2d
font_01_sfnt_off0000d73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 15592 bytes
SHA-256: dbba221d020407b4458dbcbd6267006cbb6cf3c5ec29e5e9ccd22ed0dd46a585