Malicious PDF — malware analysis report

Static analysis result for SHA-256 973b731d6eb8d766…

MALICIOUS

PDF

74.2 KB Created: 2021-09-11 06:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6bc2f7ddf8b3fc18bd9ad2aa08e2187c SHA-1: 8042c9566c28fbbea6c7686d0838e29c6406efdf SHA-256: 973b731d6eb8d76684b768e9cd90075c683930cf347ebb152ce5640bc561b632
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely used to redirect the user to one of the external URLs, which could host a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://eminentland.com/admin/userfiles/files/jazomewuxewejume.pdf In PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/94836493169.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/wugazukadof.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/tajepowabadasa.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/76114054036.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/bekositesej.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/sugixuronumolo.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/62896549030.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/76080898184.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/6758926793.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/83825186252.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219102357117549.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/ronebakeradododajale.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de7c6132f---paroto.pdfIn PDF document text
    • http://budka39.ru/files/54571955302.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/bilapifisugegelaj.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/61938374621.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/fuxawezorajiboxugos.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/3792280940.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/44428011653.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/rokepuxilorububawa.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/doxibajunuvepikol.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/sapaxup.pdfIn PDF document text
    • http://nessium.net/userfiles/file/53043264981.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137aa8f03be4---texorexeta.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/gepoxolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=word+document+to+pdf+on+macPDF 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_off0000c231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC231 15728 bytes
SHA-256: e1a57bf539ce6c31e63e34b7ce621c807a08e4bc322214f3c5c3d1141fe9d933
font_01_sfnt_off0000ea9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9B 10568 bytes
SHA-256: 3d885f9d0e690b6c2a897f6e04aa8759aad22b6aa33803492d27ec040c736c3f
font_02_sfnt_off000102bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1