Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9b34402ad75f9c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-14 03:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 24e136b18b0c37602e7ea6b619ed76d5 SHA-1: 7289c3c5b8620c5e348b386c40f23fff2fa9c238 SHA-256: ff9b34402ad75f9cbc208c01145b79d4e139c21c8ffad37c60cb15001be99a0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm hosted on disposable domains, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://uts.edu.co/portal/app/ckfinder/userfiles/files/dadolepunozaduvurof.pdf In PDF document text
    • http://dydlhx.com/upfiles/file///27149716027.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/lemoxowujenuve.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/bagazalatozozuwojujileki.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/wagigeligenefowuzesuvowa.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/viwej.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/41784927823.pdfIn PDF document text
    • http://eternoohydro.com/d/files/devizaxi.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99497222303.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/7935870eecf83aeb296fbc815c419dc9/rokevinisure.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/54174716280.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///xejugamesevudigine.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090811251454.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/57724431400.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/2362866587.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109012008587048.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/xuvuwegazorepativituwiz.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbf671716c---vasuliruzudimojajolufet.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/75116670731.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/43907855825.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/porulolovanevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=tubemate+latest+version+apkPDF 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_off0000b536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB536 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4D 10776 bytes
SHA-256: 1b4584af8f79d9149a8d9f7c6fbd0d55ee9f4bc49ffad1da4a9a634495775f2d
font_02_sfnt_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 15612 bytes
SHA-256: c1cc0da59eb8f790869c64019f5957e8dd42066d119eb652f2945a8fb61a27c1