Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac653842d010b4b1…

MALICIOUS

PDF

76.3 KB Created: 2021-09-11 04:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: c1d72999122545b9b5bb0fe4362295e4 SHA-1: 2096c1260cef2fde84e4789eb1a6a90988c867c0 SHA-256: ac653842d010b4b1164a77595c4c18206641cf2bb780669900f249fb33be9e49
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://takarasushimn.com/userfiles/files/37484400833.pdf In PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/42810435340.pdfIn PDF document text
    • http://vanhacollection.com/images/files/4496278780.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/96914407333.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/71850233065.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/7809957272.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/jawanokufukuxikum.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/29673629873.pdfIn PDF document text
    • https://hirurgija.me/files/19016929217.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/14031069934.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/duwowexijenofavana.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/fetodikulimuropuxe.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/99989383237.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/25005528459.pdfIn PDF document text
    • http://www.xzass.org/ckfinder/userfiles/files/dezamotixegab.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/80279795082.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b378ec1cf5---98648527094.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109051858293662.pdfIn PDF document text
    • http://eva.am/files/8a7982b49d013946.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210904220035.pdfIn PDF document text
    • http://mayjack.com/upload/files/maratiwedebumenefenam.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/lesijeve.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/velolukoxafifobakapa.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/82998971398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=blue+collar+comedy+tour+2003PDF 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_off0000c4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E6 10848 bytes
SHA-256: 5cf182bb1fbd41eeb5b975e0eb894f046da6d000f7b6d408b8794607335f7bff
font_01_sfnt_off0000de23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 17652 bytes
SHA-256: 61f3193ab572497cbc78b0e3073a135883193b2717235d4a03d3023c25895a2b