Malicious PDF — malware analysis report

Static analysis result for SHA-256 800e958a405ae263…

MALICIOUS

PDF

76.1 KB Created: 2021-09-23 13:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8697edb17a5eb5d515cb516138d1d83 SHA-1: 0447fe204cded64e7d58e776d2d209e6d856ccdc SHA-256: 800e958a405ae2637c596913131fe2406198766b96a8608f80ab24c198c00ae6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://cructi.ru/uplcv?utm_term=excel+pdf+download PDF link annotation
    • https://kapokcmassage.com/uploads/files/202109221805143668.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/vujofimim.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/17911909331.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/23391357794.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/33093487157.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/19375805664.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/xivomowavenowa.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6b0af062dd368a528b5f84ec94c373cb/puxekuliz.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/86726816314.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/83021668191.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/dulalijalufif.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/vitepuraj.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/11/file/20210911_211200_116.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/muragajudowafupijeje.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/14784844651.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/sekirumeraruniseza.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/55025445513.pdfIn PDF document text
    • http://beta-rc.com/upload/files/zawetuwalusikuxe.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luzegulusu.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/02d6577b2a7d70357bddd16ec37ddf1c/tojuzizoluxusekokalaf.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/forabasarivefur.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_off0000c090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC090 10328 bytes
SHA-256: d93f5e0f80d0589cecaee4d8c17a7778ff6b47d38f39a92ca09cd13eb8e0c540
font_01_sfnt_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 19900 bytes
SHA-256: bde8fbc19528609fac928a529a756fde129e5b044bf96f079df6f4b181d5f42d
font_02_sfnt_off00010b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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