Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e4578cecf6356c…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 18:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d66ace0823171a3ac2aaee7d7241aa40 SHA-1: 8a75816fcd26d6e28770d99d430f962acdf619ec SHA-256: b3e4578cecf6356c5e5a3c5f2df8b1a652ba05a69fd4834bb2e15a18c632ddb2
126 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further supporting a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://www.enredmail.com/templates/files/idCliente_/file/moxavoborugipibipiro.pdf In PDF document text
    • http://dissanna.com/temp/fckeditor/file/89046588505.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/78521876865.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109021533505998.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/66626698710.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/nokafiziv.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/3640319287.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/danave.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/renuwawomotaresetakus.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/14683539495.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/wewidigutigefanasimi.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9ba70a91---mixofoj.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/73797994996.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/fatuwofanoj.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/samenuverirelodepelig.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/bufusekovipetirug.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/bajip.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/xapamemoditonubegod.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/zowegadufesutimati.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/xugiwixomupewiretigamejiz.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/12281779783.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d936806581f7cea4ac6ace35ae67c4a1/ludozokapotobab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=logout+viber+androidPDF 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_off0000beab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAB 10472 bytes
SHA-256: 493541f4ada4e03ae19a7e39d34edca8453dd6859872e796d5cd97f2ca525fb0
font_01_sfnt_off0000d667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 17500 bytes
SHA-256: 7d1d30aea8e29879705d396eab48448ed1b54d239b8d262d7f6327b1691d849f

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