Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a04b8988c4cc4a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 20:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b089c27f6204e4dd92bef96c45f7baa7 SHA-1: 1e1ff07092d5030abb3ae2d2bd82cdc4e452d5d4 SHA-256: 74a04b8988c4cc4a99c5bb5cffc352c49664e9ed29381ba6599973879192a93b
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 0.9955

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 https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/zurolelen.pdf In PDF document text
    • http://sattosushi.com/uploads/files/xamijavuv.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/89598909496.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/36514782356.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/wapibuxej.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/gutivofipobalajojuwuxapan.pdfIn PDF document text
    • http://willbramephotography.com/tofakobuteborarim.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/xokibamu.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/kepokaj.pdfIn PDF document text
    • http://www.moyekolodin.com/files/80720093664.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/92687918430.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/48103138409.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/51185492957.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u5p333f16u2u7ok9d6t5t1llh4/25120186330.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/41145566644.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///lexefagevutit.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1630475765.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/25120408478.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/jabuwilojipibamaborimi.pdfIn PDF document text
    • https://semut73.com/contents/files/poreninoxumebaraxap.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/90068467992.pdfIn PDF document text
    • https://oferta.lt/i/File/92423902968.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16146e35fbfa9e---46473480902.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/83043441886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=animals+that+live+in+the+understory+layer+of+the+rainforestPDF 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_off0000dc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 18012 bytes
SHA-256: 1023cd79b087adb0e51ae14d75d71966f717d2230d9c008e5dc4a7c66d674e96
font_01_sfnt_off00010aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C4 10880 bytes
SHA-256: d7e003069b27c6b37835ac8b0c93e6f3c83192ba7371d2a25a16af11ca8812b4

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