Malicious PDF — malware analysis report

Static analysis result for SHA-256 76840e8b29e14b0a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 02:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d9145ced97bb18659749c355d0ee3382 SHA-1: 57490d00a7f1bf3060f10526f90700083abb71b8 SHA-256: 76840e8b29e14b0ac64a2b223f6b53eb8b77aaee6bfa38a1be6165e690739500
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to suspicious domains and are flagged as a link farm. This suggests the PDF is intended to redirect users to potentially malicious websites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://draw.pt/home/drawpt/images-editor/file/mepejogimudinod.pdf In PDF document text
    • http://damnoen.com/ckfinder/pho/files/zixoronabupen.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/8140471116.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/45064855244.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/xovipawezoliz.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/kezoguxijib.pdfIn PDF document text
    • http://goldia.cz/data/file/1445335328.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/90360461954.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161347f4a9d0c7---suvumamuxebe.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/27363474591.pdfIn PDF document text
    • https://bak.vn/upload/files/weligazurufisumovepedodaw.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/56584573590.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/xuvidikutu.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/jajinokeluzoz.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/80394566546.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/rujigenunoralodadaxobez.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/33154135223.pdfIn PDF document text
    • https://stopserv.ru/files/file/28464059139.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/fs53drdgokl2mt5aqv71e6ghae/dafaro.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/wokojat.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/55976543666.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/rodebifotujinojol.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/90024709015.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/71094264241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=no+google+play+services+on+my+phonePDF 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_off0000dd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 16652 bytes
SHA-256: 45647128fd2e92e269b7ef15ce75945e860ac18489efc88391e012b38b1b7707
font_01_sfnt_off00010880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 10880 bytes
SHA-256: d91f53fa259cf216f9f90b1e99c6475c577159d894d2a3592a611fe7083b9cf9
font_02_sfnt_off00012183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1