Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b427db74ce9a37b…

MALICIOUS

PDF

75.7 KB Created: 2021-09-26 23:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5f90a068a247c94f273fe2c2421701f1 SHA-1: 5e7c8cfa899198c5ceecfe2821cf8483dac582f9 SHA-256: 8b427db74ce9a37bc35acad63623543473d2ae00141232e747b321d54ab0d9c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm, suggesting a phishing or spamming operation. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=s9+plus+disassembly PDF link annotation
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614dba1910bc0---60228209390.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/zuxavam.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/netenasotigifuzasuj.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/74362091271.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/29751875180.pdfIn PDF document text
    • https://ebooksweb.net/files/file/bumip.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/zafavidarotidefunu.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/15356289224.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/8547550473.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/panunag.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/92736798844.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/29804401719.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/dakopumeka.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/50713460479.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/nudupufi.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/zepikixusidofatoxenupin.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/gepijajabimoruko.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/65916210042.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/tuwavikejojugefowosiz.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/davarebozomifisulez.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/jokaxi.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/60389613170.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/bogezerutigifop.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/39388005265.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161358a24b3853---kifurudon.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_off0000be9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9B 19464 bytes
SHA-256: 21e553cefb4f435810c62c879b2934a615afe2d87032e2e3522f8e1e2c833316
font_01_sfnt_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 10728 bytes
SHA-256: e1c54ec3a4c2ae85968ea3baafb16b4d94941814c77f091145ddb3d83e78f273
font_02_sfnt_off0001091e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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