Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be0bf72d72ac353…

MALICIOUS

PDF

87.3 KB Created: 2021-09-19 14:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5876f2c3a972b055c36cf9e21f43d42 SHA-1: d78fdbe23e0b0a5b52e526aa4b4e88edcc630039 SHA-256: 7be0bf72d72ac3537d734c929fdbb9990c60078a3ab77d488cea3b0961281c8b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

The file was detected as a phishing lure by multiple heuristics, including ML classification and a specific rule for MFA/one-time-code harvesting. The presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests a link farm designed to distribute malicious content or redirect users to phishing pages. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://amghanoi.com/images/ckeditor/files/nudonuzomibokaluf.pdf In PDF document text
    • http://www.addvanceo.info/userfiles/files/89687568674.pdfIn PDF document text
    • http://sivam.pl/files/file/38604115780.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/9458362982.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/xapelati.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/81529562030.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/df89t98j0dhibhmolsqfk9dv3g/37540055098.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/68963638910.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/neguxesow.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/sonuxaworafo.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/vulizevevuwot.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/vulapowo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcf82c4cb---nirixokagelu.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/78404016526.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/4421596237.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109090857142823.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/55305965921.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/54400230031.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/tixafizuv.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/baruzasitajaruxotu.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/41959047810.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/68455076297.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/bomapiwomokizusokerivek.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/vupuxuretesumipabuw.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/85056962577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=doulci+activator+onlinePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E9 10224 bytes
SHA-256: b13a79f003c2d1356608137e0366e22adfbbf3ac6132518f79d48485ebb9ac05
font_01_sfnt_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 18156 bytes
SHA-256: 4ee54d9ad0a529b0316d52649f709e56272e2781333808a82f8b0a6c8b94c4a8
font_02_sfnt_off00011d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2B 17364 bytes
SHA-256: f14652c500255db6a806989c64beb923dbc66d6206de71cc48a07708cdacd561
font_03_sfnt_off000136f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1