Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3153a8a8e4057c5…

MALICIOUS

PDF

76.6 KB Created: 2021-09-21 09:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c100f5f4f15367a190e38ad2112e1e6e SHA-1: 6949f09fd0e70a25cf19ba849e2e82bd713be835 SHA-256: f3153a8a8e4057c5ef1ff3338aea2d03b0e9a933a95ee99ec4b336ab520e445f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=transferring+text+messages+from+android+to+android PDF link annotation
    • https://altaitur.com/ckfinder/userfiles/files/56798700092.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/sufege.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/bidituwirede.pdfIn PDF document text
    • http://guchen.ru/d/files/xibekaxanonafogibuma.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/buweparemoparuwufofalo.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc5b5c507b---15872411146.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/26895944617.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/16757116404.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/48018663288.pdfIn PDF document text
    • http://watch62.ru/files/files/88964521417.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/81968822675.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/zaganew.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/67066924417.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/wanosoj.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/lavitebaxupotamu.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/kanimer.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/fabaru.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2111865796.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/telejewuvoridadali.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/wizavava.pdfIn PDF document text
    • http://generaldistco.com/images/file/63969655067.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_off0000c653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6A 10716 bytes
SHA-256: e1ada110fe6f3ee54ff5e58ef0a63796c61152581ad385eff24de8e381091f23
font_02_sfnt_off0000f6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 17924 bytes
SHA-256: d61a79f596c3c53d48c2d55eb426cfafe666272ec6fd4912d9c4a2043207f9a8

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