Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3adc8a1474beb7…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 12:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 85bb237c48c7e0dd43d4cc8a8e4990c7 SHA-1: 48ca6bc7ebb129596451ff6a38449d57f41ec185 SHA-256: dc3adc8a1474beb797a525a9e6a8b5eb264303bc601283713874c8480f874cff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=android+1+wwe+2k PDF link annotation
    • http://ossokahve.com/upload/file/85278270904.pdfIn PDF document text
    • http://wernitznigg.at/files/natesexoketatibumodotidu.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/gajaro.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb0f68a4cc---guzawixoxefixapapegapir.pdfIn PDF document text
    • http://baove24h.org/upload/files/gukowuvewo.pdfIn PDF document text
    • http://www.520amis.com/upload/files/kegejugidojelivol.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/vuvukana.pdfIn PDF document text
    • http://didopack.com/files/7177979793.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/18851171316.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/49448346188.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/kikuk.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/petagabunopaba.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/80685855178.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/37843130698.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/nojitusirebug.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/18399864830.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/62319291105.pdfIn PDF document text
    • https://binhvi.com/upload/files/42486769083.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/xivalubaginemipulenabop.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/52606554324.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/supiv.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/60125158491.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/s81q9l923ovoaag23ehduqqlh4/pubenuduxix.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210901060131.pdfIn PDF document text
    • https://baglab.pl/galeria/file/fagosuterobagukepunaxemo.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/miroduxawiwupagi.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_off0000d02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02D 20756 bytes
SHA-256: fa5a5ef8d5ce4b2a041381dfa9cc8d865fafd1956c000125580ba8c4202e7d9e
font_01_sfnt_off0001061a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E31 10096 bytes
SHA-256: 575eb96bcd9c3aadfbf361b4fab2a1081eef0cf974bd876a09d47d9098e2e7c0

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