Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8d75e10c43a2d9…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 03:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 64d7b0cc16f4295bb573395386fe5052 SHA-1: 17a0738615c9112e6995d04f127c6241dec9bcad SHA-256: fc8d75e10c43a2d9fb2d683b6df0e93cd8cef76b477609ae399d51f843d71450
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm, likely to manipulate search engine results or redirect users to malicious content. The embedded JavaScript may be used to further obfuscate the malicious links or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://smidgel.ru/uplcv?utm_term=watch+love+story+online+free PDF link annotation
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/60839408617.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/47263622249.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/pitux.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/lajejatofod.pdfIn PDF document text
    • https://recrut.com/files/files/vimupuritojubov.pdfIn PDF document text
    • http://tantrungnghia.vn/media/ftp/file/45712855521.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/fedepepajefadiruvifotu.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/poditiwojegi.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd31ebf17---7501180429.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/vuvulosiwerizex.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/rurupuwelul.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/xukusirojutosexum.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/vetefitulogekesilasi.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/zujawukapudif.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/jizokewavuvutoxazixuta.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/68796337582.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/27967177002.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/45005870974.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363ef3ec560---jefumufuv.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/moguxuposupoxutetili.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/zezupo.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/widakafatinimunokav.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/15755700447.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/54970954502.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/vipedovujixo.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_off0000b4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E7 17184 bytes
SHA-256: 904c09df17313c5a62e38dff4a0cccc83b57b0d613b472cca2c1f4d1e317877d
font_01_sfnt_off0000e098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 10604 bytes
SHA-256: b2a054cf2d0ffce15746820a02db1ff3bb93811b31b2050497ab7f342cb23a83
font_02_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1