Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba33c8cf7f398703…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 07:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f82ed8c0d615d7b065ce06f19fa96286 SHA-1: b7bb24529b856435a2d49a9ad8b416b26f1a948e SHA-256: ba33c8cf7f398703a50b0199455aa219018a8e4bd44c7c762e90db73a7e338cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of linking to many external sites, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the embedded links and the ML detection point towards an attack pattern involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://hunde-katzen.at/soubory/37772621663.pdf In PDF document text
    • http://veganogle.es/uploads/ckfinder/files/divazalaziji.pdfIn PDF document text
    • http://grandfiltr.com/files/file/36373951085.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/56880440851.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/jifarodiwubuferazex.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/95285487201.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/99863946656.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021092218201670554.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/62689347078.pdfIn PDF document text
    • https://datawire.gr/files/files/puditilijaxagapabule.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/19992998241.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/60098745584.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/27054302021.pdfIn PDF document text
    • http://dd-eng.com/files/files/jirilunusebo.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/japofam.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/59259818506.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021092512335660.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/limodiwowopuwavaxe.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/69057698423.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/dawazudebulonefuxi.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84833064804.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/dagumowagum.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/51104705839.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/timodemobarexiriguka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=oreo+live+cricket+matchPDF 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_off0000b18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18B 16076 bytes
SHA-256: 55f60286ee0caeba6c35d758c1874326db0afdb4fce7ddd7ad732cba778abab7
font_01_sfnt_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 10404 bytes
SHA-256: f9c765818b04afc1aadf79d77ab26f385a03f726fe9a14189f83a96593eceee8
font_02_sfnt_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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