Malicious PDF — malware analysis report

Static analysis result for SHA-256 d01ea17dc104b992…

MALICIOUS

PDF

86.7 KB Created: 2021-09-20 09:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a02743ff4f587f2d8d9b96bbdb469f7 SHA-1: e39ce6eba8100ced291840a10793d97dafad9f34 SHA-256: d01ea17dc104b9923cdb3cc4e5216bde3c0b66542de4c0beb81a3bba8d047e21
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs and the PDF's structure suggest it's intended to redirect users to a collection of other potentially malicious documents. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious purposes, hence the inclusion of T1059.007.

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://bselink.com/userfiles/file/96538411804.pdf In PDF document text
    • http://uk-finansist.ru/userfiles/file/22302224326.pdfIn PDF document text
    • http://bienbao.org/uploads/files/4939116594.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/92309571066.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/99226408254.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7b4816509---likiwelazudezamonisid.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/rozag.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/73294897440.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/jubokoxunogugumaj.pdfIn PDF document text
    • https://kiptep.ru/file/1775921289.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/lidowagumixoxomum.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/lafitexitumare.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/72304205540.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/49628580535.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/ruvubinu.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/76772719798.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/64332231778.pdfIn PDF document text
    • http://ippon.lv/uploads/File/nopawoladesamisaperu.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/77916642078.pdfIn PDF document text
    • https://matrixx.lu/images/judixijivo.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/bumepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+copy+text+from+app+on+androidPDF 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_off0000ee11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE11 17652 bytes
SHA-256: e4287aea4f081ad08190bd986166d3b2b015f7af386dc5be7a7b39b0a8d6ad8d
font_01_sfnt_off00011b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B6 10860 bytes
SHA-256: e5ac56eaeff0ab01de9f09f18c568b74c4aa082109d74dc334cb7fa68f9218ea

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