Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c7af9ecae9d563…

MALICIOUS

PDF

69.6 KB Created: 2021-09-18 20:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7e64408096c19ddf417389896337d0ff SHA-1: 361ae85ea99d241442920de4811a8ed2a8651d6f SHA-256: 53c7af9ecae9d56361272fa0f6e70a285398865a481047e7f1ad388237a0fe74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URIs indicate it's likely used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=stethoscope+emoji+android PDF link annotation
    • https://stormester.no/files/file/pejuwoxosuvuxinuxolade.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/tovugevazukelixivapumoli.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/tiseguxipuxeg.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/kogupenusuvopimexatire.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/43152375914.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/58476378547.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5488_20210915215540.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/nimotelifunefam.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e43dc72e2---babokidaduwi.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/96741781136.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/lixumikezogusexapi.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b74b7c6877---welofetesotewikikosi.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1614068ac1e4fa---86470926820.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/31056353827.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/pijufore.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/metetufoluxijemipabu.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/xunowirug.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/89925169197.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/60812676643.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/posigokoni.pdfIn PDF document text
    • http://orthopediedelft.eu/files/vigufevefezesavimawadekid.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/19848199685.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/demugu.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/23660082602.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/japujisajas.pdfIn PDF document text
    • 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_off0000b423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB423 14388 bytes
SHA-256: 59a390e46828b7019ba5c55e7d7b80bea9ad6d80258aed43c9836d14972882bc
font_01_sfnt_off0000d7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DE 10936 bytes
SHA-256: 1f35a5f415c0b9be26e4ca03aa7f7ed3f514ba5ac69429d29e9faf725a1189c2
font_02_sfnt_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1