Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21bfb37d4520a3e…

MALICIOUS

PDF

74.6 KB Created: 2021-09-12 23:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b809527bcdb8a750d2e7b92c2b9c72e SHA-1: 516c9b1ddb94d31ba57763c64f33b10224c24435 SHA-256: e21bfb37d4520a3eef1a26674da01d4cb720d8ca8587c95dc320e3307b5f760c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/19508662604.pdf In PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/63394461794.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/visunurumexigoduwup.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161361160c67bf---6658350401.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/74850946162.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/77216068552.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/22593235368.pdfIn PDF document text
    • https://geloracinta.com/contents/files/muxugepurijubopikutonubil.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/12783437321.pdfIn PDF document text
    • https://medius.sk/userfiles/file/96960472735.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/verilevujaka.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/7949441814.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/nakuwazufi.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/09/39879273514.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/dfdda22dd3661a45a0e229c1e41a24aa/kovujazezuroz.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/73933875026.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/51738040510.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/duzizokojekudegibumakoko.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/zosogudovew.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/raxidekamonapiwogulemu.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/28843904974.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/fesadezelowusedevib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=wifi+analyzer+bestPDF 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_off0000c2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 16520 bytes
SHA-256: 3834566cf5c2bf44536844b9ab714a0ec94aceab71c7e17ba90a69da3774b8b0
font_02_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 10392 bytes
SHA-256: be13c5187cdc61fd6bce979daf3abda54e8ce16630c7d4dfdeb32fbf2f7b8687

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