Malicious PDF — malware analysis report

Static analysis result for SHA-256 e643ce32d6a6d7d9…

MALICIOUS

PDF

75.9 KB Created: 2021-09-13 06:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 8000884fe8e2a921ade461908256df2e SHA-1: ad9b219e55f0e30822fb3255cf193b4104cd7ec9 SHA-256: e643ce32d6a6d7d99db4782a2e6c7f316ee78e112f1b731cdaa618d47d4d02de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://ketchas.ru/uplcv?utm_term=3d+live+fish+wallpaper PDF link annotation
    • http://cochemical.com/upload/files/vuxupeperoferapopofu.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/68724381887.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/78016488724.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/nitezaduzojorofew.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/46956779780.pdfIn PDF document text
    • http://k1a.ru/images/files/file/jomomofedikijudegikujuwa.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210912230137320.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/77484946367.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/68932081091.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87572027309.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/sogidasexilaliziz.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/78566709973.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/93770118237.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/guxizogujarazabo.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/69954579663.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/60018901047.pdfIn PDF document text
    • http://dobermanncz.eu/files/vixizesikejije.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/24703814583.pdfIn PDF document text
    • http://cga82.com/admin/File/tazifawo.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/lajorevikuxofimabalafajex.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ffbd57017a4ef061754c8e26f40f94b7/redogot.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/5be38de4eab655ab5fe2ccadd69eeab4/98183344035.pdfIn PDF document text
    • https://funke.be/data/file/tijukumo.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_off0000c543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC543 17364 bytes
SHA-256: 3aa2f969cc0e643a37b5de75e6ac2e8151c2e13e76534f5dcd07b8436531a1ec
font_01_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 10500 bytes
SHA-256: 2dbdcea93ff5de1d54d298cdfb9161d9ef65e2f20170ab693dea3bc096a8be71
font_02_sfnt_off00010a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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