Malicious PDF — malware analysis report

Static analysis result for SHA-256 276e38f231c1bcb8…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 18:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 71a9bd8e56b43c080c18187804d58bba SHA-1: d292aa15701906e60d23db4d675b245041821d0e SHA-256: 276e38f231c1bcb87e66bf516753435b75b451858a56a79f81e4850d2cf93239
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://wastran.ru/uplcv?utm_term=null+clash+of+clans+hack PDF link annotation
    • http://creativeindustries.ru/uploads/userfiles/file/136034652.pdfIn PDF document text
    • http://bushurov.ru/images/files/80025862998.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/xulosekew.pdfIn PDF document text
    • http://efrex.cz/files/file/lajux.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/14881530206.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/85447956405.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/zufavore.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/mebutisupuw.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109140415427470.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buvus.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/rasalaxedujefatidasej.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/zigovujapomimeruseg.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/dilorufetexiwaj.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/befaviximokamiwibudajezet.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/rixoralogaselugemepiv.pdfIn PDF document text
    • http://fitviewer.de/files/file/nafeguberel.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/tunoremivagedapit.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/64429933405.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/22561274764.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/31548241973.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614330383fc7d---fekifadepasimeve.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/75249607852.pdfIn PDF document text
    • https://togeltop.net/contents/files/wiwutofimisomiriduzuso.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/jejapeviduzisaze.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/zitomamen.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/miluxizasidijinoke.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_off0000b517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2E 10180 bytes
SHA-256: ecb8c5c85662b646f6f50df111db1f0b91f49d7d4bb9fc9a14b5526487726b23
font_02_sfnt_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 17344 bytes
SHA-256: 9944425bd5543b60aa329160083df1ab04005020bafb96a3d13d6a521c23f431