Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fbe399b82d2f1b…

MALICIOUS

PDF

84.7 KB Created: 2021-09-11 06:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 34cf70154915fe326b1dba87b8aa8cad SHA-1: 92a7f636643970c1608e4972e9f38dbb758035bd SHA-256: 40fbe399b82d2f1bbd6153ebbe5796b819f0227bca2f6eeae955810a0cfd8455
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of using many links on disposable hosting to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.fishandcosolicitors.com/uploads/files/91940957815.pdf In PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/3727142180.pdfIn PDF document text
    • http://kasargod.net/uploads/file/mogikumifuzafu.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/94784075249.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/28873485882.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/8253156251.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/53223419081.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307598c3c95---jiwarero.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/11517221229.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/28460788616.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/63327427685.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/desamovazovilonuf.pdfIn PDF document text
    • https://ismart99.net/upload/files/54917107515.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/31559258710.pdfIn PDF document text
    • https://cian.hr/userfiles/file/91616077329.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/38097125830.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210911_070313.pdfIn PDF document text
    • http://venkateshservices.com/uploads/85432887494.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/wevat.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/kisalijikozipoxijoxo.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/fejineso.pdfIn PDF document text
    • http://domosplast.hu/files/file/83350472484.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/tipujelaxuro.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/61500087375.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/64586856816.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/tafegarumejozita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=file+not+sent+bluetooth+android+to+pcPDF 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_off0000e72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 17760 bytes
SHA-256: 4b79e54edea567508c2ab3f65b449939550ce7bef87c61c5f7bf234c8b77a7d1
font_02_sfnt_off00012caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAA 10828 bytes
SHA-256: 6ada5daba28793b09d0a6cde8d6cd98366edf2b8fb224f7b058c72a2fc8c7eda