Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24c8b3cb756de36…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 02:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fbd920eef85fc2a03853220fe3c42854 SHA-1: 6b5b8517e85ebe5ff6ba9058768825d94deb1be8 SHA-256: f24c8b3cb756de360a6f4ee3c424406f331e8d41103886f0ebe67f54fd96d007
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs pointing to potentially malicious domains. Although no scripts were extracted, the PDF structure and the presence of many embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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
  • 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 http://sharon-barron.com/userfiles/files/pujopujukid.pdf In PDF document text
    • http://vivaibonomo.it/userfiles/files/ganuvidanowewa.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/15120275162.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/30671479958.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109172355337275.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210902050746.pdfIn PDF document text
    • https://intersat.lv/files/file/xefatixupuruma.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/97953070212.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/nelemujakirixigef.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/gulatexijupegizigedome.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/99744664161.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/vudumofagajetamov.pdfIn PDF document text
    • http://mlead.net/images/e/file/84345407218.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/t2rco6eg5ro4kps3qgd1n5cupg/waxemotaxativeko.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219765578147.pdfIn PDF document text
    • http://generoussecurity.com/uploads/63547871598.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/27712896074.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e5bbacfd3---28602071475.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/danabopumu.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/fomalanifutikiwaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=original+pacman+unblockedPDF 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_off0000d5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F9 10948 bytes
SHA-256: 692cf5c23836ffb488dbe74f57aa7c95b3151ce72a60ed87b2d63734bebc5482
font_01_sfnt_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 21720 bytes
SHA-256: 87b57ff019a20aaffc57b44500c921b235520a947067260a5daebf182f59419f

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