Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9fdfac6e8937c11…

MALICIOUS

PDF

74.9 KB Created: 2021-09-19 17:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0e236bd9f7e92ca612bdebfdc97002c5 SHA-1: 9e814d7c1a88148fd8179c536b68061ae1d6694c SHA-256: e9fdfac6e8937c11cd361c382226dd8d0636ef8c37710f700e7b46fdfee6c855
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs pointing to external PDF files hosted on various domains, indicating a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts suggest a malicious intent, likely to distribute further malware or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://papienbanana.com/user_file/file/sujufikolulukixirovisewi.pdf In PDF document text
    • http://giteduguedesboires.fr/userfiles/file/ladus.pdfIn PDF document text
    • http://rentaruedas.com/files/others/12585018133.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/31389967918.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/o7qmkdvosctehq18t5a1h1321m/73087136469.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/98469193488.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/fokakezugiwudigozu.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/96736989990.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/tamamabowebufelad.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/76481346204.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/bopogumo.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/wijoxuse.pdfIn PDF document text
    • https://vpmemorial.net/images/file/defoxirixegofovipesukot.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/49100280490.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/roruxinotepexijanozonum.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/dogos.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/nadawuj.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/63726580982.pdfIn PDF document text
    • http://zzquansu.cn/d/files/70926380117.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/itaroxorupepadaja.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/fubewi.pdfIn PDF document text
    • http://hingliltd.com/userfiles/84201397191.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/kasejoba.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614740cacc820---49883223057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+platinum+isoPDF 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_off0000bbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE0 10504 bytes
SHA-256: 424ddc3f87a20b45c8b766a370e0fc252d5f539f1587ee051f9ff843795362b0
font_01_sfnt_off0000d3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 18952 bytes
SHA-256: 184821f71e66dfbd1c1896dfbef860b31b6d34c315f94b1399104a292329f649