Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9aa7955f75bc68…

MALICIOUS

PDF

84.3 KB Created: 2021-09-09 04:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1db05138741719adab1a96ed169cf82 SHA-1: 2b0efd0d0bb240d3f6aa76224545abe7a47d13dd SHA-256: 4e9aa7955f75bc681743969950ddd17b5b69e67206484783ac4b09e94c1f99cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to suspicious domains and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/8703f8a628e37f95177e279ccef698d5/gegax.pdf In PDF document text
    • https://nusbetaja2.com/contents/files/89154806598.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/xokelezekoponabebemumuze.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/vujox.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/zovedu.pdfIn PDF document text
    • http://halanmilk.com/upload/files/7527831892.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/62190352858.pdfIn PDF document text
    • http://autodilygood.cz/files/file/gubarejujizosilifalop.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/toxesigumojur.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/luzevoxixit.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/37156420137.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/gomogowa.pdfIn PDF document text
    • http://irths.com/upload_files/files/94938793407.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/14786251668.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/68479590551.pdfIn PDF document text
    • https://successalpha.team/upload/files/zudizobebewilegazuwo.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/sokogafiwuvexavajibi.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/padisokife.pdfIn PDF document text
    • http://519pf.com/userfiles/files/29900814357.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/nebamavebero.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/52901482622.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/vegedutejalalupukitudewem.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135a4a37c862---dusixega.pdfIn PDF document text
    • http://yibetter.com/data/files/nesefaruvifozotuxarexokol.pdfIn PDF document text
    • http://oodow.cn/upload/file/210903104941763688lnj8mr8plcku.pdfIn PDF document text
    • https://redac.ch/upload/muwamubijupuxipax.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/fawovufazikoxabedogikugav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=king+mod+appPDF 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_off0000e60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 18180 bytes
SHA-256: 14c30b4abbdb4f5a63489ef4a6ee06e6e1112554d1566d8a222438a28f1743cb
font_01_sfnt_off000114ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114ED 10180 bytes
SHA-256: dd7810d54ec1daad5f1eb4a4e286635be450a796c564969fd12f1836aa64a5cd
font_02_sfnt_off00012b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1