Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05da41766a9864b…

MALICIOUS

PDF

82.9 KB Created: 2021-10-05 21:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a58141b21db9253ce0009f2ef5220379 SHA-1: b7ff98bfeed112aa049c47c8c509f5e66070db54 SHA-256: e05da41766a9864b3394c9fe2a2fd1b84c76b4643903efc0541d03eff485d2c9
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, with a high ML classifier score indicating malicious intent. The heuristics suggest the PDF acts as a link farm, directing users to numerous other PDF files hosted on various domains. This pattern is often used for SEO poisoning or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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://terezmisszio.eu/files/file/letene.pdf In PDF document text
    • http://normel.org/files/upload/file/rosoxosotivikovizijusame.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/19205553401.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/dewok.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/4768091380.pdfIn PDF document text
    • https://mihalex.by/files/files/pavefumaj.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/berakufovubugizikaz.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161538352063b7---jokigusivavirade.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/86051866103.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/zulimunot.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/94524766253.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/52211870656.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/68518337873.pdfIn PDF document text
    • http://jycjqj.com/uploadfile/file///2021090717112462.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/6687805705.pdfIn PDF document text
    • http://snsi.jp/image/news_file/3505735002.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/devosa.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161516fa7bdc63---12222688143.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/dezesalosuvepimafewu.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/55902760259.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/puvoxudukowubitotes.pdfIn PDF document text
    • http://195exim.com/datas/files/27819397339.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/nivarukukur.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202191195024503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=bee+gees+i+ve+gotta+get+a+message+to+youPDF 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_off0000dac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC5 19900 bytes
SHA-256: fef1269ec7626474b95669a5023474c4939aaaabd1ca9ee4993754c21019cd39
font_01_sfnt_off00010dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C4 10536 bytes
SHA-256: b4157a237087862c2300b5c44b4c657852aeccacbacb9e3cb462a68724209854