Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe15ea0d805642a…

MALICIOUS

PDF

69.6 KB Created: 2021-09-30 16:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2a69642f684f7dbd3067eced19bc67d1 SHA-1: 9f83df0e55e3328e87fd76b0e0d076be32762ea6 SHA-256: fbe15ea0d805642a8ef72edd4edfb0590cc2e743a8865ab73dee070fc89c234c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing or malware hosting sites. The PDF structure and embedded links are indicative of a spearphishing attachment delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://synerhu.ru/uplcv?utm_term=alfred+home+security+app PDF link annotation
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mebosorexarojuwe.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/nezapinevalabad.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/kuxitap.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/vanamibatup.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/21540725307.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/farefukabonajavase.pdfIn PDF document text
    • http://capableapp.com/uploads/files/36144003580.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/69942545949.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/xuvosunaxewone.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/rijaripugef.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/99519643944.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/98594908459.pdfIn PDF document text
    • http://tarp.longi.tw/uploadfiles/62423603091.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/guwusezasofuwizaganagevap.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/botenifaxir.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89887627182.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/moxuzesudera.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/vaxetamolurizejogewogikom.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/97354616078.pdfIn PDF document text
    • http://186086.com/upload/files/mojiturosogujopebadik.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/bosoralipuxesepe.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/32162816377.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/koviwevivijago.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB7 16180 bytes
SHA-256: 3ab10d2eb360dd85951434eaf8e4a50b5b302e3cfa413737c5e825d8c727bbd7
font_01_sfnt_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 10976 bytes
SHA-256: ab25d6819cd481f1821db42ebc2b59d358844b51e0b51789929ed5d6ae44bf83
font_02_sfnt_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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