Malicious PDF — malware analysis report

Static analysis result for SHA-256 0273ed0657f1d8d6…

MALICIOUS

PDF

86.2 KB Created: 2021-09-21 00:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b4819aa42ceb38e31f082a3ed4edf362 SHA-1: 160edc073a9b7145b381cd6a14cc6a857666482a SHA-256: 0273ed0657f1d8d6f25da18f2ac8194add8d7f54bc84291d9161e437377ab564
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript suggests an attempt to execute code, likely to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/uplcv?utm_term=naa+peru+surya+naa+illu+india+movierulz+telugu PDF link annotation
    • http://audyt.rowerowaszkola.pl/imgturysta/files/84363463503.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/5d2fa3d9d804635aeccab4d766a924c1/88207572595.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/91162940664.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/81236263641.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/22935341931.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/82249242154.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/tudenezox.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/davuboxapopowajumumonid.pdfIn PDF document text
    • http://tyextractor.com/d/files/zitovefi.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/jaruvexatunizigivijomupug.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210909_F9ACAACFF072D299.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/kavodobir.pdfIn PDF document text
    • https://hoppe.dk/files/63106231342.pdfIn PDF document text
    • https://31app.com/userfiles/file/litobuliso.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/84253111311.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/99748785078.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/jenonufizalakevid.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/18687802446.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/24980734129.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/82827450557.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161476572076c0---wejezumadixenemixit.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/lowejijuledosunagudadag.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/gedegefawa.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/pewifedamize.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/garinatin.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/midafekuzoweporokir.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 11052 bytes
SHA-256: a465498f5fbaa620678883f13b8694eb42c9ade41db67efaaefe275a3ca27ed0
font_02_sfnt_off0001118e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118E 1684 bytes
SHA-256: 9c928bf144e3eec6b0e52ae2bba533670589b2228405e28e178bb89e049a64b1
font_03_sfnt_off00011986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11986 18524 bytes
SHA-256: aee7f1f018482d1754f8e28c059cd9492ffeceb18379a582d91e452828e1a08c

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