Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b84ac382317aaa…

MALICIOUS

PDF

74.5 KB Created: 2021-10-01 04:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9e0f2d7a23111565586c5a7bef2ee418 SHA-1: db64883c2e3367d574b682ba3c4b3b51aa88904a SHA-256: f3b84ac382317aaa7d087b8bf9f5108278a63a52841cca95807406578df0b9ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, indicating a link farm designed to distribute further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms this behavior, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cbstav.cz/file/54116285171.pdf In PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/83704476506.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/88226955133.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/2910516674.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/xowarosevajotimisa.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/62738966089.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/64676662629.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109290211587015.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/defuw.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/40056146256.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/zigukujebod.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/komemogare.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/pejojebefo.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/35647929767.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff6717887e---kojuf.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/mapiteragebegajinigurag.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/bafulabajuvifipuza.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/50459302793.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/3963605430.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/27833101939.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/75661752068.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/80358018779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=baixar+android+pro+meu+celularPDF 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_off0000be04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD616 17820 bytes
SHA-256: 34cd6afef64c14a0b67e94a5100ec96fdce0a7a46cc95410566d41737652a565
font_02_sfnt_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 10664 bytes
SHA-256: 645417f3633abf6ae0aa7e1844f6c3435ecd66d8aaa35cd98dfb79a7381ce83c

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