Malicious PDF — malware analysis report

Static analysis result for SHA-256 569159863d6fde51…

MALICIOUS

PDF

70.2 KB Created: 2021-09-11 00:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 15f49dd67ea32cb1dec2625074c261c8 SHA-1: b2865cdf5070dc16e4b1744ddc3a9154ab99f881 SHA-256: 569159863d6fde51ed640faa65274544ba8da4ca3f65b2ef61d8fb5eb4b789dd
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous disposable URLs, suggesting an attempt to trick users into downloading further malicious content. The ML classifier strongly indicated maliciousness, and the presence of external URIs points towards a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://dezmaster.com/userfiles/file/93630017516.pdf In PDF document text
    • https://mkontakt.com/dat/file/39976131321.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/91323023630.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac4406f19---butawejawaposuz.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/12205126058.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/26548984992.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/70986768241.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/11055941734.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/xazinovavojeperebo.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/16268653731.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/sefemisimabub.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/5358147759.pdfIn PDF document text
    • https://viettrungson.com/media/Files/79107806080.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/31043211185.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/lebegemal.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/40947330417.pdfIn PDF document text
    • https://jjpremiers.com/files/bemugituras.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/giripemi.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/fizim.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/pemujekadibunim.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/79793960380.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba42491c74---49001610681.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/nigezopifodatejazas.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/41422923573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=wr3d+wwe+2k20+mod+downloadPDF link annotation
    • 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_off0000b15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15A 16104 bytes
SHA-256: ed118ddea091c19f55a474e0056f30efdf0faa4b94c6d800636053860358d16b
font_01_sfnt_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 10636 bytes
SHA-256: 5a73dd4c9546f41deda95b93576d627c43779fc11b660082fff5a9345b5b6cce

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