Malicious PDF — malware analysis report

Static analysis result for SHA-256 643e5250a44a5921…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 00:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: bbbd665acab182a1e3eabc52bbc54add SHA-1: 8f689c2406140ddffc7ba570932334efe6515dc0 SHA-256: 643e5250a44a5921fdd5898de60c4e455c61678bcc6c2fb7f464b436171f65c9
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 0.9949

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://inwebjor.ru/uplcv?utm_term=tasker+app+factory PDF link annotation
    • http://oticonshop.com/ckfinder/userfiles/files/temufupanafobawexezumiru.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/pakebaz.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/27283186516.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/95586394179.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/71474057852.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/xilebewuvunuwaropep.pdfIn PDF document text
    • http://reichspfarrer.sk/file/40678304604.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/diwupegigepugofinija.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/talegijenalobamejotabuso.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138ebd965b9c---tifevisinakisamitar.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/faxofu.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/73674733321.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/21424323373.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/6agecput5h5c9v4obtqv0ea28a/27569925394.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/40458648229.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/jubejofedizutude.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210907_70058E2A4DC9287B.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210905145258.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/37727241150.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/vunedetilivofatokopiweda.pdfIn PDF document text
    • http://8njl.com/userfiles/files/14251565572.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/94690399315.pdfIn PDF document text
    • http://electric-kernbichler.at/25338007443.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/reraxesewel.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/49823829871.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_off0000d1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E0 18200 bytes
SHA-256: d6c8866f033aeb00a7693c9563d3474b3c59c79a2ba1392842d1c29c5ef91270
font_01_sfnt_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 10400 bytes
SHA-256: d0dc26a5895c5026a4b5c15b7aad1019f2114a2ac4989a23d20cebf9039829a3

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