Malicious PDF — malware analysis report

Static analysis result for SHA-256 00fd0a90c69d8717…

MALICIOUS

PDF

89.9 KB Created: 2021-09-10 15:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a71f25dc7d36c8431b70a85d9f43b811 SHA-1: 578489b63eed54987edb72977898c598194bb27d SHA-256: 00fd0a90c69d87179c29ec7b7a7bd888938787eca7afc6dae04ae66569e9327a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The numerous embedded URLs, many pointing to unknown or suspicious domains, suggest an attempt to redirect users to malicious sites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://onwater.my/uploads/file/90502764036.pdf In PDF document text
    • https://cobaltinc.org/userfiles/file/lesiguwawujokipumu.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/30714178278.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/94766377836.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/96735019527.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/zaniwa.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/rikakakisefapim.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3b05baba---7706899856.pdfIn PDF document text
    • http://erimti.com/userfiles/file/35617955627.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/16995717939.pdfIn PDF document text
    • http://anna-bel.com/app/webroot/files/userfiles/files/36785544988.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/wewarupajure.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/pobad.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/61131944408.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/bekogaxugokowolax.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161349dfc625b4---16096184938.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/mejaj.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/puguza.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/fizulimebefinodemazo.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/91337857995.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/53879533947.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/92015701140.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/xitowudiwomabonuxubuvumaz.pdfIn PDF document text
    • http://esejsc.com/upload/files/12447559807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+art+of+seduction+pdf+summaryPDF 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_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 11016 bytes
SHA-256: dcfb26d94a651d4b0a6c315df353305f0289cc6b64913474b5a2af992996245a
font_01_sfnt_off00011138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11138 18520 bytes
SHA-256: 74dcf3db3fdacac3dda9b7c957f125d78e71685e9846329495d85c6a5edf760c
font_02_sfnt_off00014185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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