Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3d4c42469a0a0a…

MALICIOUS

PDF

69.4 KB Created: 2021-09-09 10:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 511b692a9155b5f2e9b74f08a677d801 SHA-1: fd712422c56557b8f20e5c92b22c5ad0efa041cc SHA-256: 0d3d4c42469a0a0a304167b5f160ade7576f826637e26118ef2d803b6154db00
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains numerous external URIs, many of which point to disposable domains and are structured as a link farm, indicating a potential phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, noting the presence of UTM parameters suggesting redirection. No scripts were extracted, but the overall structure and detection signature point towards a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://ap-qatar.com/userfiles/files/suxepelavosososab.pdf In PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/77625943577.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/58132962773.pdfIn PDF document text
    • http://getdol.com/page_data/file/ninujoforufabode.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/xeniwapifuvefam.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/digukepanujumokuguvejap.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/37180182479.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/remofelesufixinam.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/xupukekasirotujotenase.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/dosamul.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/29485477852.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/xapesajar.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/23253394784.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210902225059.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/55757219882.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/giwuk.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613251957266a---vemirifud.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/satibagimilezaf.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/64594262616.pdfIn PDF document text
    • http://intertribo.sk/files/19908509681.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/77373050788.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/80360471464.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/10334971758.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/98274360359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=native+client+patch+idmPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D7 19792 bytes
SHA-256: 055f0b91d2bd438c1443277f317270f0950a85fee3612270e0637cfce3696bd2
font_01_sfnt_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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