Malicious PDF — malware analysis report

Static analysis result for SHA-256 849e36210f3a64ff…

MALICIOUS

PDF

71.2 KB Created: 2021-09-14 02:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 409bfac90ab92f61d74795af6c88a123 SHA-1: 76ea7f06ff15bcba976fbb3d2c6d10512c41b1cd SHA-256: 849e36210f3a64ff5a9dfbc6ca0e11f95ea9d83adfe3ebe8c72932c4e056c33a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO poisoning campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://uhy-th.com/image/upload/files/gipapituganazamuv.pdf In PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/lozizu.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/44410470264.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/40584093007.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/9546687904.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/64744300782.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/pibamabomujela.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/83951467381.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109131731417206.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/lugagamalefomuwokige.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137ecbe3f24b---rexuvekemabulam.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/norigoka.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/rululafofirivamejuburozaf.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210913204649115.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/lemowim.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/wolawinajebagatuxijese.pdfIn PDF document text
    • https://austarpharma.com/upload/files/tegeviwok.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-1/20210901170123785964.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/xusotizemuzixuvekejon.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/38987538826.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/89681827571.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ohcuctnne1845uo9kucaqr8q8r/pajebirekotexatiluzamas.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/1338127315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=change+rings+before+voicemail+androidPDF link annotation
    • http://forum-auto.ru/data/files/fexojijuko.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_off0000b504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB504 15760 bytes
SHA-256: 4b8c8bc60f5486ff899ce7dea489c04818e89ca6767aa522dec99f6ea727aa87
font_01_sfnt_off0000dd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 11060 bytes
SHA-256: eb13c1aa4d0d79106dc7dde454851da1e1c518850f3f1a7fa53a17bb158ff253

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