Malicious PDF — malware analysis report

Static analysis result for SHA-256 b895a4c1b075f1f9…

MALICIOUS

PDF

71.9 KB Created: 2021-09-20 08:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 696f9d4521a3a2e17d14cb4993e2c0fb SHA-1: a578bd18e6d0d5282cc3a9ddda703b6731acd5ae SHA-256: b895a4c1b075f1f9a078f82396665769205f6a769acf0f92650757c1437981d3
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier strongly indicates malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=jacaranda+lower+classifications PDF link annotation
    • https://eyetracking.pl/userfiles/file/vomozixefunuwudapi.pdfIn PDF document text
    • http://kleiberit.ru/files/file/22554137031.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/35182232920.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/46876008161.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/bidoriwulileri.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/xakepirodunusivunebinel.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/giwisufetuxum.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/65857906751.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/sitokevadanimifapunemoxus.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/7768338814.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/wejovabokel.pdfIn PDF document text
    • http://lawngo.net/fckfiles/12447887584.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/3sli6c66t14ljkf5dc57stgqvj/rimadapapivumo.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630988944_6669cd3d4c.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/60130328728.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41747555762.pdfIn PDF document text
    • http://megalaserasia.com/upload///62396135749.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/wipimu.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/0djkccfec60t6aq2vjkikot2e3/40931084498.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210904_27A2716304D513F3.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/55787598363.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/katidamedozitebemuf.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/godorekuno.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_off0000b7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B8 10548 bytes
SHA-256: 0f40e44aa90093eef193163a29ca5a3835f45f6da3e545a2827adef9fde7fea7
font_01_sfnt_off0000cfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEE 16332 bytes
SHA-256: 197d0ec1c38351d7963771f5f357c2ec124c6087e079f6bd151e333d1c57bb19
font_02_sfnt_off0000fa0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1