Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3e6b90f537b986…

MALICIOUS

PDF

72.3 KB Created: 2021-09-09 06:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 44ece32d46ad25077bd49260e3bd8217 SHA-1: 0bc6f6b7deb4597b727896217fa1d78920d616f3 SHA-256: 4c3e6b90f537b98683fa7d32d38f6a6b31d1f63d3d67c42d6deb63b97cbc83e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to external files hosted on various domains, suggesting a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of using disposable hosting for a large number of links.

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://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136de0a3b87c---46491686568.pdf In PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136c0a339834---97251487288.pdfIn PDF document text
    • https://anaksemut.com/contents/files/fibusajaxotitifuvo.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/82137837694.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/lapugesilexuw.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/56252039875.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/47660307915.pdfIn PDF document text
    • https://verner.lt/images/files/83794335485.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/15524982732.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/79164895254.pdfIn PDF document text
    • http://agilesolutions.in/uploads/pokavezanome.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/43192205428.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210905225619.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/punegep.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/kokobojiwijojev.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/78922720088.pdfIn PDF document text
    • http://www.pilartangguh.com/file/lamaku.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/bebimuresoxeg.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/badilotunozoga.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/3805335702.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/besiki.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/neluzekonuxafezifub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=two+letter+words+beginning+with+vPDF 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_off0000b669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB669 10620 bytes
SHA-256: 46ace15634665e7c5b31f677694909e64c405264151a13f993af28c927eabb88
font_01_sfnt_off0000ce6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6B 17384 bytes
SHA-256: 6ce0d732d8bb1aa71d32640917fba194a64a7e98fc460478afa30b3b6add4683
font_02_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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