Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ada9c4bc53a6d7a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 06:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 48753828ad43a3a84db3bcf69724d848 SHA-1: c5f7a0194fffafa829ad7b9d18765cbd22c60508 SHA-256: 8ada9c4bc53a6d7a79595a0abeb5bacf093044d03fdc87b0eb26a9cfe0eb0b0b
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many pointing to disposable domains, indicating a link farm or SEO manipulation attempt. The ML classifier strongly flagged this PDF as malicious. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://cabini.it/userfiles/files/92026558372.pdf In PDF document text
    • https://machinex-machines.com/UserFiles/File/96320884368.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/madikosin.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/28869449861.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/31808983340.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/90074186358.pdfIn PDF document text
    • http://qwerty.pl/_data/file/72267049013.pdfIn PDF document text
    • http://jinyezi.cn/upload/lebimopiburodefewaze.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/63218941394.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/gadakoroki.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/xikunuxaxubikopanagimitu.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/rokiwewesojug.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/xukajujarakababa.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/jofepofowiwidalavowufo.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613754e47a27f---vukag.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132c5df52c06---vopuvatazin.pdfIn PDF document text
    • http://benetalent.com/upload/files/kikegatoxajanulutit.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/24686490691.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/94462119792.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/69076810448.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/77479933286.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/98218879201.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/52267882315.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109082205235262.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/9594767007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=universal+remote+for+tv+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_off0000e1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BC 10684 bytes
SHA-256: 7abf6443987decf3e6a6c0a45c17afef51574662896a4c7e7924b349518cf059
font_01_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11256 16868 bytes
SHA-256: 8272bea98958b75614bb1cc461405ad12a3a1b0193d0cfa0ff7c06f493d13723

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