Malicious PDF — malware analysis report

Static analysis result for SHA-256 47b8255c22602117…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 11:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 489e03b080386d4f48648ec69095abac SHA-1: cea36197e779a61ab7a21667ebb03819ab3b649e SHA-256: 47b8255c22602117db755d0efb3934e15f139b06c12ca150f705a42a80bc24c8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ilonew.tasksplan.com/userfiles/files/kalakobokijur.pdf In PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109060054111774.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/jewufotozupo.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/xatepuxuvuzagef.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/valibebujonilaxizojakux.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/suxijomalizomuketos.pdfIn PDF document text
    • https://profm.hu/files/file/dogurukipe.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/77984871130.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/xutirozubuxiv.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/8349961367.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/25967217787.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/fiwikurixozinelivaposabe.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210903_E0D2E72364AE3340.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/sovubevetopo.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/8318385773.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210913130308.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/mojojanofosufijulel.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/37131153976.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/gijikuder.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109061509148903.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/vixotu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613852932ca6f---31285608336.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/46558115907.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/wokojezinopagajaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=adjectives+starting+in+uPDF 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_off0000db81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 10656 bytes
SHA-256: 53f2e6d645d37b665791628a01d21c23268ff09191620ebb7b85dd69c8f7a8fb
font_01_sfnt_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 17708 bytes
SHA-256: 56ed032bc42d177ef729ad187de963278d68b4ae268c001379f2956b4d1c50ce

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