Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb1c95cf8b5e56f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-10 04:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8c85e330e47a04e17ebb904cf35fec17 SHA-1: da8fa7996c11829bd93d48b602de02a37aa829f4 SHA-256: 1bb1c95cf8b5e56f94cbe236e98e361e9d93b16c211cc52f4366b8bc595b0b3f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a large number of links pointing to potentially disposable domains, suggesting an attempt to obscure the true destination or spread malicious content across multiple sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://dermatologie-chamonix.com/userfiles/file/gezejutofi.pdf In PDF document text
    • https://minlinart.com/archive/upload/files/dinebe.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/tanibonitefop.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/roredumowivo.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/buposubidiseb.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161373d8113c0f---50195720517.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/41698140518.pdfIn PDF document text
    • http://hijoin.hu/editor_up/70955131211.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/99911927065.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109061851263927.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/68253807895.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/pivenesaxaj.pdfIn PDF document text
    • https://taperagi.com/contents/files/91481877463.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/juzopuv.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/35399253347.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/xanapopuvagorogitevadi.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/tomativaxobufuxuzuxekum.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/16666788942.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/mogizuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303d6450749---71702504320.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/32388357378.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/26753464759.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/xolimugisinasufesepofib.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/jogowibigibejigit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=videoder+app+download+install+new+versionPDF 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_off0000ce48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE48 17048 bytes
SHA-256: 35a0834fd8b5586e07f03ec7ec5892b9335c095c9d6bd68700879026f3eccf38
font_01_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 10508 bytes
SHA-256: ebd6953f338d038d75ff6ee8f65a9eaa79e794ffe3fa7264d96ed3c94568bd74
font_02_sfnt_off00011220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1