Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda594874e1740d0…

MALICIOUS

PDF

70.0 KB Created: 2021-10-03 06:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bfd963ed37f7e3b0e4ed69ecffcd5c1b SHA-1: 66d944d2e70d65505cf456179bf6d75d1b550c0b SHA-256: cda594874e1740d00933e09673542fabbe91eea9f6ece4e2a3f8697b2eec5f83
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to other PDF files, indicating a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this behavior. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://richmore.kr/uploadfile/fckeditor/file/39091690378.pdf In PDF document text
    • http://pokewaveanaheim.com/uploads/files/wepesanagasozonasajegudun.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/16211064839.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/17694133633.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/44391902107.pdfIn PDF document text
    • https://nexapos.com/upload/files/39873267540.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/3711629601.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/44328425400.pdfIn PDF document text
    • http://1111.morefriendship.com/upload/files/96468408732.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615686f254a4f---tewovalamowigavekivibi.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/24800154120.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/89819520067.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/73795731678.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210914082848-wojurivubojasanusolabesi.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210905124216.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/gepizejasole.pdfIn PDF document text
    • http://gro-felix.si/uploads/21084706273.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/kakexen.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/23666198704.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/83003017780.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/vokorixizirira.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/53930453291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=christmas+at+the+palace+full+moviePDF 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_off0000b1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F6 15640 bytes
SHA-256: 3fc38db56e951d17d9fb6ec50133c97dc6922cdaeed5b7831b5b8e4bbeac6c43
font_01_sfnt_off0000d962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 10840 bytes
SHA-256: 1d31f381218e9916df06b2fd069ad051947fe8227375c8258bd5824ef53b069c

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