Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b6d268f37b0c7d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-20 01:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8355e6eec5cd7d67a9e7af97e5d7b824 SHA-1: 126be27711846ed86f674050ee66dda7fdc54cd3 SHA-256: a0b6d268f37b0c7d4dc33737f5bf2dea8835b5aea147ecd3599bf5e6d2dea63f
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 are hosted on disposable domains. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is a link farm designed to redirect users to potentially malicious content. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=ome+tv+for+iphone+download PDF link annotation
    • http://fence-alarm.com/userfiles/files/fawawa.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b81f76539b---rutemawisifanimegoxagef.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/mutudanifusalijukowi.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/32474971741.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/87589900029.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/bebepeg.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/82386409242.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/161479df56721e---mivovopogutopifotebim.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/44281313434.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210907182055.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/mimepixidonozinejesuxar.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/zexovefobaduvijowukeg.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210905042818.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/wipilifisudowigajipetivu.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/xibiboximirurom.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/4700454370.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/vapijuxoxasa.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/57816800215.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/sirozogumukazebakigitafe.pdfIn PDF document text
    • https://cakkue.com/contents/files/81126930209.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/dipibusubit.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/depagaw.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/posuvebeminer.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_off0000d81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 10772 bytes
SHA-256: 085ca6fe9b61204590e0e7990cf343f66796acb23e3f77b25e894c940acf02da
font_02_sfnt_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 21608 bytes
SHA-256: d9e3072cb068945481397f96b70d733dd1627a2d0663e1a37c0e8cbeca95a372

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