Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3fb8cf9682dcce…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 00:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 510a32da4f34ff8b6bebfb038c8e665a SHA-1: 4b16c7e471405652fecc3d551f52a20f184818e7 SHA-256: 5a3fb8cf9682dcced2d0ccfcb41c73d1f63bffb011c191aedd8d57aa742c7aea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination by using many distinct, potentially disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=ava%27s+manor+mod+apk PDF link annotation
    • http://fantacyhandicraft.com/userfiles/file/sigetazinozokinadesujivas.pdfIn PDF document text
    • https://akvaguru.hu/user/file/5196817054.pdfIn PDF document text
    • http://fitviewer.info/files/file/baveluf.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/dovepudotudapoloxajej.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/xadizosil.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/kixozafidakelipilex.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/93038787696.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210907194607.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/pupufuvajuwofesexezijava.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/pofifazexekibudifaga.pdfIn PDF document text
    • http://vo23.ru/upload/file/25642938362.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/momuperoveniju.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/59450031369.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/85171440385.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/refazigedodi.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a836f8464e04d41bfcf97f1cddb9fc4d/lejinomoni.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/bilibodoxipive.pdfIn PDF document text
    • http://knipia.com/userfiles/file/42822042266.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/vezurevog.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/39264840512.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/38276275525.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/54755422093.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_off0000d327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 17300 bytes
SHA-256: 58dd0470f8a88e29a1640b0c703bf373c56beb864430e3577116276ffb8d722a
font_02_sfnt_off00011826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11826 10360 bytes
SHA-256: fbb1982c8a4a832b07e425de72e89f3e641d12841c0edd7d0e04ea9b0c0903a4

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