Malicious PDF — malware analysis report

Static analysis result for SHA-256 40394026dc081275…

MALICIOUS

PDF

73.2 KB Created: 2021-09-19 05:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 37845f98af6122ba4da8dd552b20e52e SHA-1: 7d58cdbdefaeea2c70abc34a6b856d975c58531b SHA-256: 40394026dc081275600eefcbe0531a6716f8b430fecaf9e4f56dc2f69e81a503
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to various domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of many links suggests an attempt to direct users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://dottoridegregorio.it/public/file/87487702906.pdf In PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/11247477903.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/93610345661.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/vixutavedowevupu.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/sasevajapulipuvemufi.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/9910366719.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/39164024320.pdfIn PDF document text
    • http://vititanon.com/user_img/files/84891087317.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/pivizagawigejuk.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/66612778153.pdfIn PDF document text
    • http://sieuthibds.net/images/files/vojuk.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210907195821.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109190814094706.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136626776d15---42686872314.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/wetox.pdfIn PDF document text
    • http://redactron.com/userfiles/file/57121499902.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/fugotajegulimefamerikape.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/givejisovurojumixowameve.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613914d716985---dewukuvobup.pdfIn PDF document text
    • http://araratmebel.ru/img/file/kuridadupuxep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=street+fight+apk+downloadPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/44576814431.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_off0000bd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD47 10864 bytes
SHA-256: 1b748a97ef59c60b92d8ff726ec3f8fff89d24cf9b4582f7476a8902539602bb
font_01_sfnt_off0000d627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD627 16160 bytes
SHA-256: 4e385d07c6cf3e0605b5e2a85b8e456717198be80c2b3c97291de8df79594385
font_02_sfnt_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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