Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ffa0840348b6419…

MALICIOUS

PDF

85.1 KB Created: 2021-09-14 11:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c2d9876a7c3be0bf32d2a889d40f6c71 SHA-1: 96588aa4341a9849f57c8c740c6fc0c3bc0b41f1 SHA-256: 1ffa0840348b6419a4b8108d0b243b1a2ccdc252c742d68c890c7ba8f113f43c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=contacts+app+android+apk PDF link annotation
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/godabab.pdfIn PDF document text
    • https://fuoriscena.eu/file/37779760936.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/nazupetaxu.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/rinadalorikilesuzamatos.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/52034302191.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210912131749-32524705761.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/bapoxo.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/pibikukuvapuzolifud.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/75017162160.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109041913463890.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/74987120275.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/ruwisitejewuxa.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6ba706b76---10520248106.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/12625552443.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/dutuxa.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/mepamuzumiwefabaxatexavo.pdfIn PDF document text
    • https://satesayap.com/contents/files/mizevavonalexibixeji.pdfIn PDF document text
    • http://agavietnam.com/img/files/37064070402.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/nisaxi.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/foxuxan.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/bosokawelofanevezodefaf.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/xafagepig.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/173913263.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_off0000e7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFE 10452 bytes
SHA-256: b06481d9c5366cf54526639e6d2b181400971f764aef457bed14991cb385c730
font_02_sfnt_off000117e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E5 18056 bytes
SHA-256: 8c06477291238bb0e4909f9a61304dd19983c9a6101d2d5b727e11ebf8e27d3d

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