Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3db4b77a2e7369a…

MALICIOUS

PDF

87.7 KB Created: 2021-09-09 03:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 529c8fe433d0b152c1d3d90247da6c91 SHA-1: 58274feec9a794e4827a71362398376bd394900b SHA-256: c3db4b77a2e7369aa0b7d90e814e3c678f46f60fdb98b2cdbcf5ca8263cdad18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm designed to obscure the true destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, possibly to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://luathoanghuy.com/uploads/files/65268051970.pdf In PDF document text
    • https://nedimgame.com/calisma2/files/uploads/mafuxulutaxororolobi.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/42705362916.pdfIn PDF document text
    • http://elskenecologie.nl/files/36657840395.pdfIn PDF document text
    • http://klenderbio.com/upload/files/34191782750.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/78598966858.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/24377185311.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/kajenamemebowizifapimo.pdfIn PDF document text
    • http://agilesolutions.in/uploads/xosomosixe.pdfIn PDF document text
    • http://cloverdiamond.com/file/66365094793.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/gonutekifefexep.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fd644c2b8---67721178454.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/84817626992.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/93558189107.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/51514561571.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/megerenajewiduzilakamip.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/22329985335.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/96701591810.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/xugexekunat.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/65069064494.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/ketebemomeropage.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/tiziwabupunum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=garena+free+fire+download+obbPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 16240 bytes
SHA-256: cef7e779b7aa280d2221ccd0f00b64aaf34cbfab3036436854254cc14e5cdb29
font_01_sfnt_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001054a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054A 19872 bytes
SHA-256: fd0f9de1d0f19474734b1f9a86e0fa521242a6db8ab5e5838a7ad265ac02d978
font_03_sfnt_off0001393b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393B 10348 bytes
SHA-256: bfba554e45d92e6b83bc458f2ad25d47895ab08a995b7634733bc177c13b1026

Open this report in the interactive analyzer, or submit your own file for analysis.