Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf0cf55aa5d9ce0…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 07:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1540309375663f197211befbff440e4f SHA-1: 0e8307d45eb54984bd2817fc038b2d6bc2b0ebec SHA-256: 3cf0cf55aa5d9ce04cc416aabd1c9548a98350e35e4f9ee50a502280166a3d36
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on potentially disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, and the ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, contributing to the overall phishing and malware delivery objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613feaccbef52---sudabogupiwo.pdf In PDF document text
    • https://classykitchen.pl/web/uploads/files/wegipapepibobisujozozel.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/lopoduwetugawulotolaro.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/ladifomefamozarevi.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210917234336_jtt12b.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/47010325300.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///86373082126.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/fokomonajenonowemebad.pdfIn PDF document text
    • http://canadianrockies.info/files/file/kolofa.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/38431253462.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/gazim.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/sagegutox.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/37319821350.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ginepiruxuke.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/saxuwakupeloravuni.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210904053406.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/47907485791.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/jusikalulu.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/legipibivolularonu.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/50353925298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=download+remote+gsmedgePDF 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_off0000b093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AA 10584 bytes
SHA-256: ced69a044f00fda67ee9b505e0aab627743ac061d764b290c614e9327973bcbe
font_02_sfnt_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 16836 bytes
SHA-256: 90fb6b6771c03da35d39d2ec2fc05dbe113ccbe4fa6af5b6dc8772fcc4e7e082

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