Malicious PDF — malware analysis report

Static analysis result for SHA-256 85309958916d4892…

MALICIOUS

PDF

73.3 KB Created: 2021-09-10 17:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 20855b8036aa0cafdf6e0258bcca6d64 SHA-1: 440c63f198cae5a4b942ad9b8c95efc9f6766246 SHA-256: 85309958916d4892fc08e6a41336b15a125ca24e2d1686d41fea8b1d61efba54
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the sample, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://degeninhotel.ru/admin/ckfinder/userfiles/files/90282061456.pdf In PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/0dae98fa1caaf9e268c95e97517ea580/69919649063.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff07f2e75c---gumasipazupajinuwabuw.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/kowubefeb.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/mujuwikozidetufuwit.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/29560583593.pdfIn PDF document text
    • https://medpressa.ru/files/file/malevo.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109041210428789.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/wefivujikidozev.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/kukijowaxed.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109072116097361.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/78255219226.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/62242245378.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/galuwarureravonedip.pdfIn PDF document text
    • https://petikdaun.com/contents/files/60699511332.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/mawonatibobamakovabelin.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210910113543.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/72901759680.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/sobosolodi.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/93752735960.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/xabesu.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/23620220870.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/mitagelatuxifomibife.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/pedigojemewomuxegumunox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+omega+paradox+download+ndsPDF 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_off0000b71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71D 18316 bytes
SHA-256: 76e7c4ef27baac173d849d6d0794cef23cb46c28afb3cc8617589da707af168d
font_01_sfnt_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 10824 bytes
SHA-256: fd17adbfd1579dac876a331515c7bfbd08e71688a05850d6942fa2084fbf083f