Malicious PDF — malware analysis report

Static analysis result for SHA-256 019a6b3579387fa3…

MALICIOUS

PDF

86.7 KB Created: 2021-09-16 10:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a946d6b29b6b97c3402b39684946eb96 SHA-1: 95fd2a852f69591e389b4b8899545cb0606a7cc1 SHA-256: 019a6b3579387fa354c9115841be716dbb0a165e9c7aea10f275379f674de3b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF with a high ML classifier score and ClamAV detection indicating maliciousness. It contains numerous embedded URLs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing attempt. The PDF structure and embedded content are indicative of a malicious document designed to redirect users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/1mu5bkdg3na31r1ov8a7e51r82/6619960531.pdf
    • http://xenangheli.vn/public/files/44667832898.pdf
    • http://giaexploring.it/userfiles/files/pisadas.pdf
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/56869914851.pdf
    • https://kligi.viart.lt/ckfinder/userfiles/files/58286594375.pdf
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/jaludanavafinunidinakudiz.pdf
    • http://sangtaoad.com/uploads/userfiles/file/87733080147.pdf
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/25873910832.pdf
    • http://eksternest.be/images/file/gekirafekijofel.pdf
    • https://luckyfood.itweald.com/uploads/files/613236a6e11ad.pdf
    • http://htwy.com/upload/file/62629246724.pdf
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/87530906055.pdf
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/12975409343.pdf
    • http://biolabsrl.org/userfiles/files/lepunez.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8eace467992505ed277a5478205cdb42/xevurabigek.pdf
    • http://metisentry.net/ckfinder/userfiles/files/nunatatidame.pdf
    • http://manilag.com/FileData/ckfinder/files/20210909_509E0C8AF7775598.pdf
    • http://huarui-bio.com/upload/files/74623821691.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/ruweketos.pdf
    • http://www.binghan.my/userfiles/file/buzuxevuloje.pdf
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/pilatiduxez.pdf
    • http://busankid.com/webfiles/board/file///kajujapesajibik.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=3+player+board+games+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed17.bin
fea1088ab38d4ffa2f34291a21f6dbda7b87ce4a5d947c57f44a8006354cfb2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 10964 bytes
font_01_sfnt_off000105ff.bin
68ba32f521a310b2c2326988e22356c9d60e85d88626b2946e2b813d659ff0f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105FF 18080 bytes
font_02_sfnt_off0001353c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1353C 16792 bytes

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