Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff1d4c8789d8531…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 17:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 21815f9482a047c25dd8b9a38d7be5f0 SHA-1: 1cea38276f76b42ac64c2c1c48900aae03c24383 SHA-256: 3ff1d4c8789d853186488853ebd983aae033985132db1ce6cce2b6799f89220d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://makenie.com/upload/files/zelukufe.pdf In PDF document text
    • http://epodhajska.eu/UserFiles/File/xomemesigeme.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/9360574930.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210907144426.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/44397806925.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/sovexopufen.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/48103054864.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/gevujafuxabosodele.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/99168596877.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/faguremokutogim.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/69840285902.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/tuguropikenevovonitoweji.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/15505752666.pdfIn PDF document text
    • http://sungder.com/upload/vomisigufupogabix.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/rilimepimeseme.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/zevad.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/37835267807.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/16150947751.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/neseno.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210902130412.pdfIn PDF document text
    • https://ptogel2.com/contents/files/vufukexi.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/wenevetomoxupinumimej.pdfIn PDF document text
    • http://goref.ru/files/file/famugexozu.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/12848004568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+stream+the+tyson+fightPDF 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_off0000dcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 17864 bytes
SHA-256: df941059f3be24182f1ad92c373b2e16db4c852a8efc18afc46a23a6b49a1707
font_02_sfnt_off000122f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F8 10804 bytes
SHA-256: 804f6ce8d1008b08b59db5898f54bc05e9edb58c801e99cbcd28d0e742930024

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