Malicious PDF — malware analysis report

Static analysis result for SHA-256 626be03bdbad510c…

MALICIOUS

PDF

80.9 KB Created: 2021-10-15 23:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a195377115b72fb7918ef336ab7a7d40 SHA-1: f79bacd0d740b4726cdfeb597c9cf553d9353bbb SHA-256: 626be03bdbad510cd7e699610c8dcea8e0e437bc1cbc0f038762fe0a626032d4
74 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 point to disposable hosting. The ML classifier strongly indicates malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript may be used to further obfuscate the malicious redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://wastran.ru/uplcv?utm_term=graph+this+table PDF link annotation
    • https://alshamiltrading.com/alshamilfiles/file/lelemuwow.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/38742256820.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-2/20210902130526255208.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210904233652.pdfIn PDF document text
    • https://renetravel.ro/images/files/kuworodubovibekopuruzi.pdfIn PDF document text
    • http://esangsok.com/upfile/files/64809443079.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/porugilereju.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/jotoginowizidubakakoxaki.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/75220520087.pdfIn PDF document text
    • http://erex.hu/upload/file/69137039877.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c35b79cd2afefc59397296c69e42e9de/nexikoregu.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/depogakobidasazefiz.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/nuwovaveburodivujud.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/kiwagotoderuxesovuzuk.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/saxeliwez.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/62232818564.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/guwodoweragu.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/64979082687.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/fb707ec8028c4779aee22e428c0162b7/tavavomiresavav.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/tixozimepanezobumug.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/2395623923.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/37778638335.pdfIn PDF document text
    • http://hmed.vn/upload/files/67510951061.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/bamefafekomutavixiji.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_off0000dc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 10304 bytes
SHA-256: bc16d3b26262754591ce863b18e9b183c4c9c4c04222913520b176f49008a63d
font_01_sfnt_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 16664 bytes
SHA-256: 5eb93faa8030f507752f348a22182a064f439ca061a03908f1a01cd9d9dfe2bd

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