Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f50eb556e33dfa…

MALICIOUS

PDF

70.0 KB Created: 2021-09-17 01:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6fcaa4b4c09cea429e7fe3cf5488b629 SHA-1: c06dd2c6c7697081f03f806359e6f53977834b3e SHA-256: 11f50eb556e33dfa00823e5fa963f1876607def8a5e1644307c5c381b605d637
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 high confidence. It contains embedded JavaScript and numerous external URIs, including a link farm on disposable hosting. The primary attack pattern involves directing users to external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=how+to+unlock+iphone+2020 PDF link annotation
    • http://hitecds.com/userfiles/file/71710956793.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/dojurupirirawe.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/84094717010.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/41763186434.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/17302013104.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/6472549501.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/66605540508.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/fuzufanatasuwop.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/ruguxumovajexurodesibozo.pdfIn PDF document text
    • http://hexindechem.com/upload/files/50034378855.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/xatosogedinopotedidoje.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/88448517841.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2e83da699d7dc787e8b1fa5084969ae/43716198775.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/80792395594.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/vipiwo.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac76c1960c---68865819979.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/patuginufivu.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/93053873547.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/72324895810.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/20543802136.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/puridux.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/xolinasal.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/85651512792.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/giwigonajen.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/selegozonapiveduxa.pdfIn PDF document text
    • 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_off0000b4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD13 10552 bytes
SHA-256: 59547d33766f0050990ef7e4de3c61d8c32cb7e2f2e1377f0c16a5b25492e49a
font_02_sfnt_off0000e513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 14704 bytes
SHA-256: b524497506ea249c2145af34037ae96d091ac9600de82d35d43eff68a82aba62