Malicious PDF — malware analysis report

Static analysis result for SHA-256 514f842770d0a047…

MALICIOUS

PDF

70.3 KB Created: 2021-09-09 04:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: b42122a348c77f7b60cb781c7c6b0a2e SHA-1: 9f0672c51d14cf26fcff80caa2374361e47328bb SHA-256: 514f842770d0a047a80247de2ef5d76a1d3e2743c70c191760a91ccdac013044
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 0.9992

Heuristics 6

  • 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.
  • 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 http://petra-koparki.pl/Upload/file/bujitolaril.pdf In PDF document text
    • https://psfund.org/public/uploads/files/cms_files/gutikaxuluwamekasojinuxo.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/gofubelo.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/98007696706.pdfIn PDF document text
    • http://labonscafe.com/userfiles/feguwujujupilakax.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/93279611968.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/fowigidu.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/46877985459.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109041736356345.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/62942778405.pdfIn PDF document text
    • http://viorina-deko.com/images/file/38353919047.pdfIn PDF document text
    • https://isleo.com/i_photos/file/502287740.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/23607054935.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/tudigamitivaxafogegamupo.pdfIn PDF document text
    • https://viettrungson.com/media/Files/68707608359.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/raxan.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/worototenubafej.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/11143742400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=bottle+flip+happy+wheels+gamePDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/dovopisiririjizabexodajir.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_off0000afb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB2 16884 bytes
SHA-256: dcf198dd05ef1bdf1ad15c539f8ec456519081c8473e69afe0bef9b0e884da26
font_01_sfnt_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 10852 bytes
SHA-256: 81b93f900084c306a066f5925abd4eb53007fbada971c4167de09e24597d7089

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