Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bfa8c4bb2682a5…

MALICIOUS

PDF

77.9 KB Created: 2021-09-09 00:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0b5efa63bfa916c2c36164df96290ad8 SHA-1: 9c350e8564a101e70276c84737bd2cec65325068 SHA-256: c3bfa8c4bb2682a508d34fbf4458d6a9f07f370afbaf92d777a9b92cb18dbbb5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • 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://tsolisp.com/files/file/jedalarewininoxiw.pdf In PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/jajide.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/25430226345.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-6/20210906123144432620.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/60442403295.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/41922184461.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/82110040988.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/pipidagux.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/fososajenewikenipa.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/72927279426.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/liririsezoza.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/47729931632.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/sizebadigaverodizob.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/bututor.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/fusibajupekumadelizipap.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/45092419012.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/25807925459.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/52814067432.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/44390265374.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/gaxozufavozafanas.pdfIn PDF document text
    • http://evola.it/userfiles/files/38676209388.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/31682151739.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/70811182102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=firestick+film+appsPDF link annotation
    • https://easyown.ddproperty.com/datas/files/70335858414.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_off0000cbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC2 18192 bytes
SHA-256: 5f672fc127b34998c4fbf9c61a36da504110cf6fde621f001f63e2ec6f7aeb17
font_01_sfnt_off0000fa2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2F 10484 bytes
SHA-256: df79eb9e456ac1321e71b12f99ea5849fc931afd02a9427a52f9e53a2ee3ce3b
font_02_sfnt_off00011215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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