Malicious PDF — malware analysis report

Static analysis result for SHA-256 893853d3523386f5…

MALICIOUS

PDF

68.4 KB Created: 2021-09-24 20:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 017e356f976b952bad5b0854234aa86b SHA-1: d7dbe5cc2ba65dfeb91f4efd30f56fc9f3ab07fd SHA-256: 893853d3523386f511bb677ac3ab04593049a39939c2f5841c88484fd1c38c4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to unknown domains and are flagged as part of a link farm. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38997944044.pdf In PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/xisimamopik.pdfIn PDF document text
    • https://satesayap.com/contents/files/82158035484.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/tepurod.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/46678732404.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/pidisomu.pdfIn PDF document text
    • http://vit-physio.de/file/vurizerimovip.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/66782596749.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/xatunuxisobipojizisoj.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/54397391195.pdfIn PDF document text
    • http://cke.hk/userfiles/1766729236.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/kidawo.pdfIn PDF document text
    • http://fnathservices.com/upload/file/52399820952.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/mefizuvutuvutaxopuwiw.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210904180112.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/winurexu.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/24755252091.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161436b67a4bde---jekerotiketid.pdfIn PDF document text
    • http://casauthienan.com/fckeditor/editor/filemanager/connectors/php/temp/file/sixakarobavu.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/7407765988.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/bupobovaj.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/rarapowofitirudop.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/57878379147.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/15d229849717b00577923defe7c7373e/ririlumixavozuzagim.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/kamapupufoxitopogagofajup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=france+1+tablePDF 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_off0000af7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7E 10012 bytes
SHA-256: 80906d7727ce4400c4362a5aa4adcdf40a020fe894a08e989040c82e8d9ea157
font_01_sfnt_off0000c5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DC 15260 bytes
SHA-256: 9670c726b40eaa93746a3fb9ec2deb185d091f23fee178ceb279b8f62e4782bc
font_02_sfnt_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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