Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb40e20f0937f3c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 17:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 42821a2320756ed370f7cbb5a45a5c14 SHA-1: d0de91cc83fa80c72486952546623cdaca1b8a6b SHA-256: bfb40e20f0937f3cd4ddaedb85f36dc1258da49f664e593c65223a738141b489
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains heuristics indicating it is a phishing lure, specifically requesting recovery secrets or private keys. While no scripts were directly extracted, the presence of embedded URLs and the nature of the phishing lure suggest an attempt to trick users into divulging sensitive information, likely for account compromise. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://silver.jo/ckfinder/blanc/files/zolisuwofawejavixo.pdf In PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/tijijenubiwuwewobex.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/51370399796.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/63884092313.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/41904409833.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/33392447828.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139348db6368---19201348787.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/fasujisesi.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/37762566225.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/vanedejipiwedoju.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/sitofe.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/geliravoxuzajopufo.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/fikuvoga.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/zutisi.pdfIn PDF document text
    • https://campermagazine.tv/public/file/77555230517.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/luruxesibapivak.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210903_3609FAC92FCE361D.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/nupenesixefo.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/42254138849.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210906032322.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/xuzigol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=my+gmail+passwordPDF 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_off0000d77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 10592 bytes
SHA-256: 7e3826b98fb7bf462a220c28088ec96a6bf2cb965d354013d25958eb7254d852
font_01_sfnt_off0000ef75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 18420 bytes
SHA-256: c05d8b7ebeb908a33388c3ae516098e73d1e42e4e546b47ad302ad8197e52a68
font_02_sfnt_off00011f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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