Malicious PDF — malware analysis report

Static analysis result for SHA-256 98612d22f57b69f8…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 15:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 169057d39e687e63b94dd2ebf02d8a4c SHA-1: dae638c6059339a03c21282a34302c3fc4f35080 SHA-256: 98612d22f57b69f8c6a99e3ed2ed6b81b99b94367a6d5b78fd5af959dc07556c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a high number of external URIs, many of which point to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to distribute files, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://quaint-house.com/images/blog/file/48453574364.pdf In PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/desufuzejobajafibemo.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/26755986421.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffac4e4e62---rejijejat.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/82433600855.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/96023281365.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/vedugovoguzo.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/84803163371.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/korotiwadukijo.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/pewomaxejepabufobejij.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613aca2851c0c---gonujisivodagoluvawi.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/ruvevamesurogejugig.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/daxaremifitirosipu.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/66068923090.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/31515446391.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/19315250119.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/pikoxilijimubaguj.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/razutubutofidop.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/vokobaxalewipe.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/najatadogemugovanobakudu.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/61669239645.pdfIn PDF document text
    • http://dongphat.net/upload/files/jofofusu.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/7716891645.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/wodebedewon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=nfs+shift+apk+download+for+androidPDF 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_off0000d0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C5 18492 bytes
SHA-256: 4b9ac1eae80af49bb759cfaefe2891769d90d31b790218b40966e91f5455f3af
font_01_sfnt_off000100b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 10616 bytes
SHA-256: 2f6e4a3e504b6c61d305769469222e8461a90295e1bb0e0834aeff24abc91d04
font_02_sfnt_off000118f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1