Malicious PDF — malware analysis report

Static analysis result for SHA-256 889bcb4b1f366191…

MALICIOUS

PDF

86.5 KB Created: 2021-09-11 17:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ec28653da93111f92b971c046058ee2d SHA-1: 33aa17bd27e74668c3a260e98faa8f644feee54e SHA-256: 889bcb4b1f36619149fde2825b9b81decf822cf5336fb0c1ec1d204bcc0da5bd
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links, many on disposable domains, suggesting a phishing or spam campaign. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c503404ffc---75853068273.pdf In PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/23917219953.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/62244109316.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/sifamuzusaxit.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/71315511926.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/26787747401.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/wugeber.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/dafagosatukagofutebefije.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/4s9gu8kitf0n50n6pq0h63bs63/fudirotabakiwonebi.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/56875626236.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/jaridedov.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/sawavogufit.pdfIn PDF document text
    • http://tcihk.com/userfiles/lenim.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/gakepurobulige.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/23759123532.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/laxubiduvoxofizemidasoxa.pdfIn PDF document text
    • http://preiss.at/upload_files/files/xavizonolononutinir.pdfIn PDF document text
    • http://grimastone.ru/files/7066370182.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/lumamokinufipof.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/26845627147.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210906_5FF6AE8DFA8CB6C5.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/31118150795.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/45041177850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=android+sex+games+listPDF 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_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 18088 bytes
SHA-256: a29118f0aef625b6a06cab78ecd38019739fcbfda794003fb0bde74f5f089917
font_01_sfnt_off00011c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A2 10676 bytes
SHA-256: 34f6d36a99e5e5ea9ccea2060a4a243bfc2ba4f4512135255723a799d00348c7

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