Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bbcf8df874ddf5…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 20:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd096cb6a3941cd39b35e73a4993d253 SHA-1: 7ff3de198ba97dcf754230be85f0b40d94c91869 SHA-256: 55bbcf8df874ddf5c438eeb9ef2974328b7af75c89ee86f0a2a71592edf9256c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the embedded links. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://archism.ru/uplcv?utm_term=jocko+willink+discipline+equals+freedom+pdf PDF link annotation
    • http://dainichiji.com/upload_ckr/files/88769954277.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/91876157316.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/19875105962.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/18991601873.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/57091418172.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/zemilosixifobo.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/jomelez.pdfIn PDF document text
    • https://pr-dienst.ch/file/14451195587.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/31514394153.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/nanegorumumusepuvuki.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/7155559159.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210908_181FBB6525767F0E.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/laxejijubo.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/1786592677.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/sofuwuxaj.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/gakepopowakefeli.pdfIn PDF document text
    • http://deforma.it/userfiles/files/81897022979.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/somosuvo.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/18331169667.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/riloxawi.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_off0000d1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D9 11100 bytes
SHA-256: 40152ef8669aa38083ce5e6840c3d3d96fb8eacee7660f2f4d71db4145dbc1cd
font_01_sfnt_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 17404 bytes
SHA-256: 5f02981f5780d3f740cac8c457d7ee073e5c2cc1417cf394df8a1f312539043a
font_02_sfnt_off000118a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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