Malicious PDF — malware analysis report

Static analysis result for SHA-256 81cf9fcd3ef82dca…

MALICIOUS

PDF

70.6 KB Created: 2021-09-09 16:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d5936b97691199fc64acb1cf830b2dff SHA-1: c0d1c97dc04aaea7b617b5d42df39da237a09aaf SHA-256: 81cf9fcd3ef82dcad27a0c18b9ce718b60ce202cbd498d81f29b7c0efa57b54a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially malicious content. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to redirect the user to one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://netcentricnj.com/ckfinder/userfiles/files/866423795.pdf In PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/suxikorajoku.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/44832746843.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/malat.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/85637426111.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/47590553382.pdfIn PDF document text
    • https://pecsikult.hu/files/file/rozimenomebapegiveloriza.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/masodemogum.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/nexaraxixulipirufuti.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/wofaxo.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/1947089658.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/surijap.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/05080f7c236624aed73cb4c16db73b85/biwuf.pdfIn PDF document text
    • http://teplospectr.ru/images/files/81531455338.pdfIn PDF document text
    • http://cartopack.be/Images/file/birafifemusiso.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/1187138691.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/wiviruzojolozub.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/lemimozizojunezid.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/11035882831.pdfIn PDF document text
    • https://cityface.cz/res/file/18755274519.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/pawilemov.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/42663103573.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/40984004654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+happens+if+i+restore+my+phone+to+factory+settingsPDF 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_off0000b3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE6 10988 bytes
SHA-256: 7031e7c860cb778c27b035efb1bedbde54642b1d4f5692c5f82449f55eef7cc1
font_02_sfnt_off0000e554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE554 15576 bytes
SHA-256: 30d68d110bd4818deb19d6cd8ebfe4f40aa68d2f144b89f50cbb572e202739ac

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