Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a9b3f8e38c9e2c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 15:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8f71025907e2444009109785ae2fc13 SHA-1: e7f59092ad402e45d8ecd909b7ae8fa49d9db852 SHA-256: a7a9b3f8e38c9e2ca9a71dffdea31ed5e5c136fb31dde11f594f97d59c9195b6
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by an ML classifier. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a tactic for SEO manipulation or to distribute further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this. No scripts were extracted, but the nature of the embedded URLs points towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 4

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=kingdom+rush+frontiers+android+free+download PDF link annotation
    • http://yourhandmadeitems.com/userfiles/file/2472482417.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/bonapidu.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/kibededijorakuvisagag.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/25094539732.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/sojulijik.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161315d8352aff---nawegopujimobemegesizifap.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/rejitowuwawa.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/14785829995.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/sewekenobolud.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/77928851407.pdfIn PDF document text
    • http://nenorm.com/files/files/xutadiruwati.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/nowegemuluzabetapunepu.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kefizidimitebu.pdfIn PDF document text
    • http://crm333.com/documentos/file/40605564381.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/xilanagajalunanaruvafifi.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/dejoponetovagirusa.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/76224922716.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b43e1e313---fesonuxuduxulawitijon.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/10182099586137fb68d0a94.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/sapibamu.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/bosidekoxujub.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/jutosanisexonotar.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/26609027781.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109040548504136.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/nevagigadafolozaleziroget.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_off0000d59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59E 17368 bytes
SHA-256: 1c439c90f1695a1aa93579d41c03b8d4aeb01091abbb28d7d886462410cc4dac
font_01_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CC 10976 bytes
SHA-256: 98900853783edcedda555fd496be37f91c5f35a60ef912735985c58383af0db8

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