Malicious PDF — malware analysis report

Static analysis result for SHA-256 958e3d6cb3478c1c…

MALICIOUS

PDF

78.7 KB Created: 2021-09-13 07:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1ea29e658896c6a412b01e28441bebdd SHA-1: 9c801b2394536db5da40600fed3f44fa10fd392e SHA-256: 958e3d6cb3478c1c15563a6dd7099629e021758f9570b173cb3df255bef58510
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cafeau1ait.xyz/js/ckfinder/userfiles/files/21437797186.pdf In PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/desozukamimo.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/86130649609.pdfIn PDF document text
    • https://foulardfotografando.it/file/zevuxomalegoxidipuse.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/fejerimiwagibapu.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/gejatibet.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///19758581287.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/69610641149.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/77313336487.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8945b4a62410d9ec85312b8303ca450f/korusemetut.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/kimorenovasojeliwera.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/14976743481.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/79644198649.pdfIn PDF document text
    • http://katachizu.com/img/news/files/89695576676.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/tisizu.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/62130924935.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/16424073578.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce3635972c---moburepivev.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/geluduxaga.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/66073149536.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/36923356145.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/57447281710.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/69150064447.pdfIn PDF document text
    • https://mollis.rs/files/xizixigujasijitibexatapob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ben+10+ultimate+alien+game+androidPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/livaxibatin.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_off0000cf40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF40 10748 bytes
SHA-256: 05f3320ad3dbc669559232f0578fdb032e0c070088661bfc2832002bec7cefcd
font_01_sfnt_off0000e7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 17532 bytes
SHA-256: c61d3e988acfb6d691d13071cf025a4949c76dfb69566c931d8d5b7e280702fd