Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab951b13bfd4ed51…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 03:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cdbd3937af362a99a1193c20008ada2a SHA-1: 7b8f4b47e8c29ac065c4952b2a9663311bdf2810 SHA-256: ab951b13bfd4ed51bffa986c2c5600dafe8fa4aa25a98029c73f1603b0781e05
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, directing users to numerous external PDF files hosted on potentially disposable domains. This suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://inoxbienhoa.com/upload/files/sivesumudetes.pdf In PDF document text
    • http://hyundaidongdo3s.com/images/files/74872066583.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/16618480183.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/gowubojewuzirofujomudaf.pdfIn PDF document text
    • https://mollis.rs/files/55342579504.pdfIn PDF document text
    • http://budropol.de/Upload/file/deraf.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/fivuzaxizesawifa.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/12883857943.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/79994269777.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/85635706697.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/papujosipopilegidosuxuvuj.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210904043535.pdfIn PDF document text
    • https://clove7.com/userfiles/file/30226605419.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/29517992249.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/27982991634.pdfIn PDF document text
    • http://platcometals.com/images/file/67407416130.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/75477139966.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/27314861549.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/lemojabepipawazap.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613644b4cfc29---23874836451.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/1474570906.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/34374126197.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136abe98b2e9---ragiwarupukalikeweg.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/lavokazubimitabek.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/xunejowejitesedomi.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/27104223248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=watch+friday+after+next+online+freePDF 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_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 17844 bytes
SHA-256: a2c420458324f46377f91c8731d6b725c4073f06c16e17bd23c09e0767d48645
font_01_sfnt_off00010737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4E 10612 bytes
SHA-256: 7028c10107495488aefae1645e2bf927e43406fdb7bbc5670b7d2b876d8ab3e7