Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b516318961248fb…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 16:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 14c689234a44ebbfaafab90079de1910 SHA-1: ad294ee4b04ba68264c975ad746b8b798124c5ad SHA-256: 2b516318961248fbfb98b3bf0a45b939c8497424fd1c489039c0f5f4a4df2f7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to lead users to malicious content.

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 http://zekejozsef.eu/FCKfeltoltott/file/86286283788.pdf In PDF document text
    • http://le-bouquet.be/userfiles/files/59570013701.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145525e96dab---mozuturukane.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/83904162007.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/rulut.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/kivifolarero.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/71433792112.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/17140146086.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/megolimorisimu.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/20965921630.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/winalinikodakafuga.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/mogimofijepit.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613f0c056a6f5.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/85297005783.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/vikejinikinozijem.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/fipatojogagi.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/10257289043.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/nibadejiforitok.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/wufotaka.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/14529172537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=wild+blood+mod+apkPDF 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_off0000d7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 10176 bytes
SHA-256: 0895023e8d46c325817f3baa5db8d52797d493c51067279986780d6bd99296f6
font_01_sfnt_off0000ee41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 17628 bytes
SHA-256: 70fadb7b11fe0735ef4b9085303d8686095066d2953a4206739ab6ddeb1404e4

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