Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d9b574ab38c51a…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 23:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e5722f35b464deffdb6f0938bf1508f SHA-1: 76725097e46071db350a8b5661b2d7f69e928b3a SHA-256: 47d9b574ab38c51a1542e6dd2c0f6720f801479ba193e9fc33511a6c25476537
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to trick users into downloading malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lead the user to a malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=malayalam+ebooks+free+download PDF link annotation
    • http://domgr11.ru/uploads/files/65494458211.pdfIn PDF document text
    • https://dm288.rs/slicice/file/gadel.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/70437063955.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5bd0af14---zokire.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/40dc58684360c5995f7c5585c3ace09e/6440148449.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/fafenovofijusiruwetefodi.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/45848699010.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/88017284685.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/lejanibegove.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/68714112364.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/lizorenesunuve.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/90488600948.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zavemutekejofuvibedus.pdfIn PDF document text
    • http://redactron.com/userfiles/file/81170449564.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/68255946568.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/38787329680.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/duzedoluzoxozonilibit.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/87530521736.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/3912986131.pdfIn PDF document text
    • https://lecachet.fr/docs/files/36402711608.pdfIn PDF document text
    • http://hanifeugur.com/image/files/36055051828.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/99539321428.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/zanowefovizez.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/71753502670.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_off0000d500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD500 10748 bytes
SHA-256: 4476e3f0fcb83d028d4336452163160a1f2ebe9857db5bea63f9bc1c1783cbfe
font_01_sfnt_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 16880 bytes
SHA-256: 4aabcb60d6c47271c1da98cde084e17d92bb5fd0a87c4691bd4166be11a21bde