Malicious PDF — malware analysis report

Static analysis result for SHA-256 5435bf22ea84c46c…

MALICIOUS

PDF

75.6 KB Created: 2021-10-10 13:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 70c4e09497aea56c06646f77a5f233f8 SHA-1: fa3c83c3700a90b40ddff843577d9f9fede25f66 SHA-256: 5435bf22ea84c46c9e1bfdb56a3fc947e572be29ee9cbc2714b207b6e700162a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The document's structure and the presence of many external links strongly suggest it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://gjbuyerbroker.com/userfiles/file/86897503018.pdf In PDF document text
    • http://hndgyl.com/v15/Upload/file/202192990295190.pdfIn PDF document text
    • https://96662888.com/editor_upload/file/9357589428.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/wikomatenesuza.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/revedirumesovuwiwiduv.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/wefolovugexugafowurobe.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/subiv.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/pajojinojujufojipam.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/javulagajog.pdfIn PDF document text
    • https://searches.onlineconvey.com/userfiles/file/145700394.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210922_180818.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/39286557422.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/gigized.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/fiminizilog.pdfIn PDF document text
    • https://aildf.in/userfiles/file/79783280002.pdfIn PDF document text
    • http://netart.hu/userfiles/file/59667758421.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/wugitarunuzogi.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161541c0b93e5d---85065090918.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/lifelupugupo.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16146927c2e2d2---pusifug.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/59193868454.pdfIn PDF document text
    • https://tekstilkent.formenemlak.com/upload/ckfinder/files/gomuzuguduwame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=alvin+and+the+chipmunks+showPDF 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_off0000bf18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72A 18368 bytes
SHA-256: b201b213610e4a225b4c23abcff88fb92af6713df6ca50e035346f695a1b7bb0
font_02_sfnt_off000107bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 11004 bytes
SHA-256: 201802e649fb95169b51f56293b390d25610104ef610431b9a959ce7139a3d07