Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f581597fc0bb7fa…

MALICIOUS

PDF

79.1 KB Created: 2021-09-12 23:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 4ab6410265a045f57a233832db03e835 SHA-1: 4e12c357e3a983034e63bbeb3d84338a530fe662 SHA-256: 5f581597fc0bb7faad5b8d02d605b51479eccd0666207a44b61496c8795fd1db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a likely attempt to redirect users to malicious content. No scripts were extracted, but the presence of multiple suspicious URLs strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=braun+and+clarke+2013+thematic+analysis PDF link annotation
    • https://aletihad-group.com/userfiles/files/96082810782.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/dopaxupop.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/bologonokajijuvo.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/zederigumoruvo.pdfIn PDF document text
    • https://petala.gr/userfiles/file/1921496033.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/66306580324.pdfIn PDF document text
    • http://022-web.cn/uploadfile/file/20210901085851765.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/pupofoxuruvigowa.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/ridegedele.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161386210a238c---76128292687.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/59555649404.pdfIn PDF document text
    • http://anpo.vn/upload/files/tanideneko.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/nozoxonegule.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/tafewajisowipadonesipig.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/nojexirat.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/bogobo.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/69389777011.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/zipabuwebovirasiju.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/59998448590.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210906_B057C6D0404E0009.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/92417893943.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161325ab9ba089---fonuweperofonasasadiso.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/75281474835.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/nizavepifofedefo.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_off0000d078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 11340 bytes
SHA-256: dd6865e7774741d4e29e9ea0aeb5b9f2e02d4ee4ac6f1a8d8985e111411f4f6e
font_02_sfnt_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 16760 bytes
SHA-256: 0310a5a8d81b424a65cfc0458be8fab53188001d4e70a6248ae024147f253272