Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0e044d3cd0489e…

MALICIOUS

PDF

70.8 KB Created: 2021-10-03 16:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eb516fdf9f1b29d144c471a3e4959db0 SHA-1: 00cca38c3ca6ead3bf6770ff79034e65230375e6 SHA-256: af0e044d3cd0489e0045b0de9b0c62569872d39d5a1209f8993aec90bda70c4b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The PDF contains numerous external URIs, many pointing to disposable hosting, suggesting an attempt to obscure the final destination. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://palakkadtourism.in/ckfinder/userfiles/files/46583730953.pdf In PDF document text
    • http://pomelieagency.com/userfiles/files/76238847567.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/meripetizoxugodalowawipuf.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/fibagixarap.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/zolexiraxapusejef.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/44489683407.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/81950793849.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16156adcd3f983---48516359849.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/xudesotafav.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/98259873979.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/561349349.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/28867367919.pdfIn PDF document text
    • https://sinarwaja.com/account/files/56512967091.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/najodikeminifisazopoxur.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/8273381637.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/65564018062.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/somugekizefanesusefewodaf.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/73439987610.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/82391898406.pdfIn PDF document text
    • https://vietcuongcorp.com/uploads/news/files/95396140046.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/5526365099.pdfIn PDF document text
    • http://winso.tw/userfiles/file/32597379868.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/40750136546.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/97113796762.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/gijujizur.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/70740835146.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/45093273837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=diligence+english+definitionPDF 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_off0000b2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC2 10492 bytes
SHA-256: 623f6a9e77ad622649c225e118052474379aa8ab2dc07b5a1e1bcb30ba557dc6
font_02_sfnt_off0000e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24A 17148 bytes
SHA-256: 8b00187acc97f3c23c8b1d5032b9861fa05c1f4cbf2230acfb1f49667bc47380