Malicious PDF — malware analysis report

Static analysis result for SHA-256 75552634a153aa28…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 00:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c33c8eef4da63463b68b6842f5ae54ff SHA-1: 77833db3f7914f97a0bb5a5147a53fe08cd0da88 SHA-256: 75552634a153aa28fa632eb6ea0b7fcab9eb6ce360b9107cb7e31383e63314c5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=watch+brooklyn+nine+nine+season+7+episode+1+online+free PDF link annotation
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/15032882103.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/xavopulojewafugelikofogaf.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/67427374833.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/71294212583.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614137e53e32a---dokalate.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/5409361344.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/molupet.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/nupalunojuwagogeb.pdfIn PDF document text
    • https://fishuntpesca.it/file/sodos.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/wevavidapuserotesaxewaget.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/67022143408.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/pekawokelofizifatupew.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/59ff82c4936f05417179744d1e0b84e1/42413546482.pdfIn PDF document text
    • https://salwangurugram.com/files/busaragof.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/taver.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/mepavalilabesixubebozavu.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/17350663913.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/46597233497.pdfIn PDF document text
    • https://bdata.vn/upload/files/boziwaz.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/30836678230.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/94775805423.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/57624065946.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_off0000de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 11160 bytes
SHA-256: 30ab89c4d539e9433e97e98c7597b3a0638037d4e74b284825b1104d830039b4
font_01_sfnt_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 17620 bytes
SHA-256: fb64563743288c21c8c1320ff815eeb8c0c51b285107f9be0cc43e4c79f1c9e2
font_02_sfnt_off00012669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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