Malicious PDF — malware analysis report

Static analysis result for SHA-256 6471a727e3b6cff4…

MALICIOUS

PDF

86.3 KB Created: 2021-09-11 18:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1159f26922f081eeb865b99c5f2b60eb SHA-1: 954373ca2cb6d447a98b4a4ca65a5250e4eb00b2 SHA-256: 6471a727e3b6cff45252b7afd3f32de9a2dcdbb0958850a2bbed8fc83dc2e6d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malicious content or phishing. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://crewmak.ru/uplcv?utm_term=cave+android+games PDF link annotation
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/98487860973.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324bb13b73f---17248364670.pdfIn PDF document text
    • https://cityface.cz/res/file/12586804163.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/21977649639.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/rogir.pdfIn PDF document text
    • http://salespate.com/userfiles/file/jozupi.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/vuvukexiriwuje.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/ropojo.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/ragoguwuwisix.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210905_758500F3CFEBC2CC.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/koxegemonifajurupeluz.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210906_032308.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vezupiwediwapajofula.pdfIn PDF document text
    • https://asi-filter.pl/files/file/zetolutobobanepeke.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/wokagidaweta.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/solagowiborajazegabad.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/negegikofokuzugimexebeto.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/munoperomaleb.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/gudoxojif.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210905/file/16308323156411.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/29853860565.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/56120690830.pdfIn PDF document text
    • 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_off0000f04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10866 10544 bytes
SHA-256: 5cb19297ebf05d772b08abb12043e5adc25d91f7e90d6bd6ffb63ca0d542e455
font_02_sfnt_off00012031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12031 16916 bytes
SHA-256: 5971dc39f43a780f3cd5962d1f8cb8b0144b9e486e598607e07c4dab8988802d

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