Malicious PDF — malware analysis report

Static analysis result for SHA-256 00386bb810205a87…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 05:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3437dc5f8513b142074b6e3594895663 SHA-1: e06a58d0df575a6bd04af2b67258c8fe7104f5e9 SHA-256: 00386bb810205a8734dc138d2b966802c1744c3ca82970af71a7b91c5cfb14bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests a link farm or redirection mechanism designed to lead users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

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://er-trans.com/img/produkty/files/niperuwopobekisimuwuto.pdf In PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091913065780554.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/nufawozaropimerulegemazab.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/labepirawufulunaboki.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/79030833197.pdfIn PDF document text
    • https://basisnomor.com/contents/files/20696495146.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/15gf1cf81uvqn765uoavdc9ljf/27342912888.pdfIn PDF document text
    • http://dsraxys.com/uploads/veguzo.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/bonubogemowuvenu.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/18123753804.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/febakowupelakefonagiv.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210917054938.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210917_BB04D8EBC1E69323.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/71808923188.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/xuxutidi.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/23519600999.pdfIn PDF document text
    • http://nensi.si/upload/file/bejavorodulelotewogamon.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/89382681746.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/46559236088.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/70823729744.pdfIn PDF document text
    • http://yejida.com/userfiles/file/73456639898.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/mebodugeniliruxubumite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+miller%27s+tale+pdfPDF 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_off0000b21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21E 10536 bytes
SHA-256: e98386189afd955af3caa00f490a2d45699b7167dd775e19dc17ff1d6aa8256e
font_01_sfnt_off0000ca1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1A 15568 bytes
SHA-256: 571b519b64498ddbc676aee62c97581d316c66776715d7674f2aef483e54aa67
font_02_sfnt_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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