Malicious PDF — malware analysis report

Static analysis result for SHA-256 92642d7e8f8ed2e9…

MALICIOUS

PDF

68.9 KB Created: 2021-09-21 00:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c3d86ed588707104b5c9038672c1e47 SHA-1: ec2cbc527ff37e9efc89b2286821083398bd3d3e SHA-256: 92642d7e8f8ed2e96af99d1aaa909ff86c941f42a87bf0d2f5dcc4cdd9ae440f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were extracted, the structure and URL distribution point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://luiginoiobbi.com/userfiles/file/82225485860.pdf In PDF document text
    • https://weborder.cloud/userfiles/file///48546499910.pdfIn PDF document text
    • http://domexpo.ru/up/file/birapo.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/weriwakuretesinisixo.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/15230803479.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/11342647089.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/tulorekunamoz.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/30456991715.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/giwodoro.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/fufawevunajilubix.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/15144733870.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/xifukuzupona.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/nivurubaxofu.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/fexonesubuxuluginoni.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/xidenojobomigi.pdfIn PDF document text
    • https://majubesar.info/contents/files/77848601065.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/73313726640.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/70513001869.pdfIn PDF document text
    • http://erdbau-rauch.at/buvikogunomawizajujisip.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/lumubexafamijepokomapu.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/26862675195.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/lifafoduzapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+game+of+life+2+free+download+for+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_off0000b054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC866 14976 bytes
SHA-256: 07e6c5ecd13fb3874c0d12cdffba2b729cdb742208e0c7ba998d5131bd7600ca
font_02_sfnt_off0000ee44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 10704 bytes
SHA-256: 9bc0c965cb9bd1716b6388e122f6a91181e7333ec79666915dfbe76fc3f72e7d

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