Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0f285d0f55d15e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 19:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 42e2b80a6ac9bb77f08f62842b18eba6 SHA-1: 838f91b917c72833f2a18baf879df3261488d7a3 SHA-256: 8e0f285d0f55d15e8b3afd68d4ead1464daf62e1e090700a3a82bf54ab54cf0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=osi+model+and+function+of+each+layer PDF link annotation
    • http://elvirajogsi.hu/ckfinder/userfiles/files/kelufupizuzofozudiko.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///38162456178.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/57703025901.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/pasotaniwetoxolagokes.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/3564875454.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/62563072513.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/dafibobasofejuvo.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/wijefomasudaluwonu.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/5014776017.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/88399566265.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/pokosodiratewa.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3509ad5b9---87554425589.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/kiteximenedere.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/89486037981.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/sosarirezipux.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/wufiradevugikivipibakam.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/5931631062.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/jabeloranelov.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/93178226385.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/demupixomimekew.pdfIn PDF document text
    • http://vitrine-prof.com/files/88357392354.pdfIn PDF document text
    • https://mihalex.by/files/files/nugefedowati.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/mejufudug.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210906022544469.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f5037021d4ae99104f2d46b165ece992/405400427.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_off0000de2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2F 10980 bytes
SHA-256: 40256bb89f8d751f647e48ccc2a97d87055b8f20914b004c3fa04fb09ef7678f
font_01_sfnt_off0000f789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 18104 bytes
SHA-256: 1411277b1295af404021770dab09cf25c6a4161d98ad9df733f8814932093e52