Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbbb00dd2a85efd…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 17:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2bca31e4279b7c4a4d6bc2dbd0e3ff4b SHA-1: a612d14380443c79afac775fdea6d31d7f874682 SHA-256: fbbbb00dd2a85efdb7f49b65905218f3cbc7413f53fada9a99e8de08de262fd6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/65004648273.pdf In PDF document text
    • https://aslimitada.com/userfiles/file/87982800883.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/ravuj.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210918072306_725168.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/wiritebatuguranosexe.pdfIn PDF document text
    • https://laps.pl/userfiles/file/vusilowi.pdfIn PDF document text
    • http://e-sheremet.com/img/suvolumawozazawekoge.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/16696015015.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/198009596.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/lekijominubag.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/2241940510.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/14405546088.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/xururixufuxopopixaz.pdfIn PDF document text
    • http://yejida.com/userfiles/file/zelilusuwimojeme.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/88869505674.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/sobolelobalurimojobexijix.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/fuzol.pdfIn PDF document text
    • https://onlinendttraining.net/files/pomusidazinefewi.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210902_DBDB9C2A4D6B7CAC.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/6641863378.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/tijezobarazezeniwatesipoz.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/97335603232.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/rupubevikefofamigu.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/63335674862.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/nimixefurepazuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=insta+hd+downloaderPDF 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_off0000b415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB415 17756 bytes
SHA-256: dd09637db9d0c2d2d03cbefc6b7de5c40e53a64dc6f105965c15ee28704b2194
font_01_sfnt_off0000e12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 10292 bytes
SHA-256: 4d9f693b649049a07326a16dcd4b515bf4c8af8b3b5e69a47121d40dbbc41468

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