Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bea297b77f009fd…

MALICIOUS

PDF

72.0 KB Created: 2021-09-24 10:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 859359fa7d7896170b04337dc48fba9b SHA-1: 81a24baf1117bce258f5f4cfb95502eff8b29f42 SHA-256: 1bea297b77f009fd7496361cd5156b37b023ac983808f4388aac0b2959664d7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various PDF files hosted on potentially disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an intent to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://orderpoet.com/ckfinder/userfiles/files/vawibukomagujazuv.pdf In PDF document text
    • http://pyhunlian.com/uploadfile/file/bufasabatow.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/viwototidokujeri.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/zabirepanut.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/97856025606.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/77556444866.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/17591755473.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/wilalabezonujunodiluvof.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/81301909303.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/53299975383.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/60800488004.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/naxujizuzosegif.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce36499c0d---14256974869.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/81350634187.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/banetipado.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/wudexuwufarojedidewames.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/gexofofobekufifadodokuzup.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/tulewotu.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/76181704722.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/81934186321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=blossom+blast+saga+game+downloadPDF 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_off0000b9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D0 10676 bytes
SHA-256: 2cb4768a985f40d385659ddaf29a80cbda402b7a59e628ccdc08df51a1ab7659
font_02_sfnt_off0000ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 15840 bytes
SHA-256: d778e104614e875f557fa3d63bfec6bf3ba287dc4f9edb5dfb66406f02e69d9f

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