Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ee205132fd199b…

MALICIOUS

PDF

90.4 KB Created: 2021-10-07 13:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a73e23833c042043bfd94ae219ce53ab SHA-1: 0fdf6394988afc0bc02afb95f3cbf8fc4841d375 SHA-256: f4ee205132fd199b450ad62b5a6b1da9cc1cfeebf6dab06ebac9b1ec00ce5d01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and URL analysis suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://gtlitalia.com/userfiles/files/mujajotumufamavonorokosab.pdf In PDF document text
    • http://gallery4walls.com/upload/editer/file/75190146821.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/gesefu.pdfIn PDF document text
    • http://hexindechem.com/upload/files/pasisawedesuverone.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/toritilefolejixavesinines.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/fazutalume.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/pinawalomopolubizaw.pdfIn PDF document text
    • http://asfalon.com/__files/file/32806471067.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/rukefawixinexu.pdfIn PDF document text
    • http://headrepublic.pl/images/files/munigebidedaj.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/96820879946.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/78680962568.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/10883128287.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/6519292308.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/rofetajupenebixevanamerat.pdfIn PDF document text
    • http://splogservice.ru/content/files/55623592572.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/35295264447.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59733007574.pdfIn PDF document text
    • http://dakov.hu/_user/file/tawaduxezavesuki.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/50542243756.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/91690536082.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/dasumisutofaxorit.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/94213941093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=data+mining+exercise+solutionPDF 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_off0000f84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 19736 bytes
SHA-256: 702939b10a45b66eb620dcb05402ced006b777ce2f9d4da8fb7914bd0d3fae85
font_01_sfnt_off00012b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B19 10776 bytes
SHA-256: c01e7321ea130d3759f4c373284f2e502b3fa7b227b3f1272f5e6974dbbfec9d
font_02_sfnt_off000143ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1