Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d23e8353ae17ce…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 00:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b50ce9b1cf4f5c2cfb7f715f89c64bb SHA-1: c6d163e5812c37d0e53b5ec94b5a7aa5a21c907d SHA-256: 39d23e8353ae17ce3c8a32991a8f452882664f390c7be69cb1c6ad6f7e35188c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for initial access via spearphishing attachments, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://commune-bourre.com/userfiles/file/92013226033.pdf In PDF document text
    • https://dobre-akce.cz/media/files/file/jatejufugojinesazesis.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/rulufuvopanewepanibo.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210918052903.pdfIn PDF document text
    • http://4rrecycle.com/files/file/90649757870.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/dejewovijebojo.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/59886164672.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/nusinetisu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613108f566598---majoxizusedatur.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/30223841415.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/82541638954.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72507418602.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/1532218904.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/bc1a2eb28f9c75ddd81115302b1dd4cb/2468268065.pdfIn PDF document text
    • http://kmsenior.org/file/files/lerano.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/tojekomukoverito.pdfIn PDF document text
    • http://clickvay.com/upload/files/35723312376.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/jowasil.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/fitububobawepoviduneroto.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/dupawukevawamoge.pdfIn PDF document text
    • http://rooptex.com/uploads/75585958146.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/xebosirekesipikosenifife.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/mubotevibune.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/rasujezuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=quickedit+text+editor+apkPDF 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_off0000d0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BD 10540 bytes
SHA-256: d169eff5bf0f92d78d438b0fe81f68ba705e91f68ce2877067147b131459f0ff
font_01_sfnt_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 18652 bytes
SHA-256: fe1a11a0259d3807fb1cd813e3c5705450adcb3f4f7cc9fb8eb9e0234f48515e
font_02_sfnt_off00011916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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