Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a69d3c8c239d03…

MALICIOUS

PDF

67.9 KB Created: 2021-09-30 10:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: db0cc24fcbc6d1190d765eedcdff1dce SHA-1: f864bec2a0ae4fa536a90b5e17819b07835d80e2 SHA-256: b5a69d3c8c239d0366c50e8712a9a2eaa1d3b05674ada371bd5711879f86a901
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is structured as an image-only document with a click-outward action, typical of phishing lures. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to malicious URLs, which are numerous and varied, suggesting an attempt to distribute further payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://adesso-moosburg.de/images/file/27623075404.pdf In PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/40444871146.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/99575246661.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/39260016602.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/sunufon.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/25056143127.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/18104099778.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/famowigerugeronuwanure.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/43584297701.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/45331602990.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/85231885563.pdfIn PDF document text
    • http://wohingltd.com/userfiles/kenatovakilerativogovu.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/dotadareludapujugar.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/88638977320.pdfIn PDF document text
    • http://langyupharm.com/upload/files/kojadazupawilinutuvoto.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/lapodibikog.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434efd6bfa9---kikil.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/16243741134.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/93535987031.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/35560006540.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/sevedemuwarisaxedowone.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/37818099853.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/15118943200.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210904123816.pdfIn PDF document text
    • http://slsnn.ru/content/files/lozape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ana+frank+pdfPDF 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_off0000b1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AC 13984 bytes
SHA-256: ed69156eeb86afb989c3406b85fe85cd0dde5395e1fb19288579b383687e3be8
font_01_sfnt_off0000d3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 9908 bytes
SHA-256: 6f7b739674ed467f16cf9b573ca93bf962f45daa90c36bf0e943cfed87953856