Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b435a58c52b8e1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 18:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3aea42bbe7aecb16a999e342d42f55f5 SHA-1: 318925d021c7b0739c41471c0ecd724a097b9cb3 SHA-256: 25b435a58c52b8e1d5622c64e0aed54abf9ef30007f6fa6e9e633da31eea0274
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, with one specifically identified as a potential phishing lure related to 'go movies online downloader'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting many links on disposable domains, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://queure.ru/uplcv?utm_term=go+movies+online+downloader PDF link annotation
    • http://elektrostroy.kz/ckfinder/userfiles/files/16125898217.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/93376470185.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/memizisufokunedukewelug.pdfIn PDF document text
    • https://iwistw.com/upload/files/wibisokid.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/32009722663.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/weloweruwijefizuwu.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/36508392560.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/tibawiduvoburisog.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/55298963772.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161427fdd71e6d---43956708263.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/61762895233.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/ratibodemefonidufonafexig.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/rerunazozegunerex.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/topujabopojizuraxetot.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/xifojomom.pdfIn PDF document text
    • https://tekmaker.com/upload/files/fevobukore.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/vusurodivo.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/molaxavewiledos.pdfIn PDF document text
    • http://tabletopad.com/images/file/15032581304.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/gemawe.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/25168153383.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_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 18580 bytes
SHA-256: 9bccc0635ce0af2a43b1bf8ef620ef66514f0e8b172c0de34763ff9bba74818d
font_01_sfnt_off00010e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1C 10500 bytes
SHA-256: c9ac872abea0f4a29f2dfdafe704fc9760590e278dc39be85556aaf8fce1b6c8
font_02_sfnt_off00012605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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