Malicious PDF — malware analysis report

Static analysis result for SHA-256 585dcb290371e6e1…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 09:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8ef563bf6e4d7214e2f38032861becfd SHA-1: 7274fc9d4f92b4a267d104e6f0cf320a600f1f72 SHA-256: 585dcb290371e6e11fc6cb2c7b82f3da447ab9e46300b0d1babbdf6098b6fff1
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the heuristic analysis identified the PDF as a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chcial.ru/uplcv?utm_term=the+daughter+of+time+pdf PDF link annotation
    • https://coonvalleycc.com/userfiles/file/74546756604.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f6ea7248074a7932c04ef3331656030f/67138544836.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/jatabit.pdfIn PDF document text
    • http://minerva-collection.net/files/files/33159804670.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/19359334445.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/nikoni.pdfIn PDF document text
    • http://envigest.cz/upload/file/19448458248.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/81171052553.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/93164491616.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314d094eb37---sapeteputadofafuz.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/90613957061.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/gazexijetowigujimisudavis.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/sikewowati.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/mapal.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/vedefelodokekig.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/26240398590.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/puzoxedometokiluludapofu.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/58523409385.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/ginuda.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/05/16906961275.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/jizemidokakevoludelaxebex.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/75735297590.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_off0000d527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD527 10692 bytes
SHA-256: a3149ea4a6de676388579af53aa8e658dd15a00f66c14dea0c4e2675e31327b3
font_01_sfnt_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 17840 bytes
SHA-256: 4a0c41c9aa8e423719ab0a2cbe3cbf9778c97cbfeee5149999b04bfaf86e4268
font_02_sfnt_off00011c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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