Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29c8f45387e8041…

MALICIOUS

PDF

75.6 KB Created: 2021-09-09 23:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac72a1ace0a2b91c80ebe620a1028ebd SHA-1: 6918159f20791ece7b49176f036da18073aba176 SHA-256: b29c8f45387e8041c23cd4745c253a79aaed5a0aa106ec95a7c11699294fd4e2
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 point to disposable domains and are structured as a link farm. This suggests the document's primary purpose is to redirect users to malicious websites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://garderoba.sk/images/_file/diporizenif.pdf In PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/xewejinosesirem.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/413990021cdb1fc6134e46f3fbcb81f0/14501940691.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/a327f6a5e9e7bf7e6d74fcede35cb7aa/vigudawapemetifa.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/mefokeb.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/76003829918.pdfIn PDF document text
    • http://djpress.pl/Image/files/42276968933.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/duxuxaxuvovosivotesadila.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/3820143467.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/13342520470.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/susafug.pdfIn PDF document text
    • http://trivio.it/userfiles/files/9195072528.pdfIn PDF document text
    • https://pcetravel.com/files/file/gizer.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/50203076265.pdfIn PDF document text
    • http://ametansk.ru/uploads2/nenevewevukuziwum.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/61282052210.pdfIn PDF document text
    • http://cissi.it/userfiles/files/91736208494.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/92437002069.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/kuluxorulemadenone.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/jeketemabu.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/10661802947.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/4921105333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=surya+12+mantraPDF 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_off0000be50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE50 19964 bytes
SHA-256: 12da831d7ed40de84228e77c435697325ec104d53cf0dbf5cc9bfc66161fd9ca
font_01_sfnt_off0000f240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF240 10172 bytes
SHA-256: 1bb2dde59668537104d9f1f528a4565ec96542da2795b59951cf85b9e8e6e304
font_02_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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