Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4b03e4f68cb067…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 15:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ee37f7b96b6cad5456116f260d366b43 SHA-1: d89d922964b78604e1f4c1b1709c7e877c3dd05f SHA-256: ff4b03e4f68cb067aba2d71c93a852f34c48275143b0e79d206add6042905b46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO poisoning attack. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of many external links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://shindah.com/images/ckeditor_img/files/texeremevekunemukisiw.pdf In PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302231636a7---xuzojezuteneg.pdfIn PDF document text
    • https://matratva.in/userfiles/file/jemifoturibefo.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210912_153311.pdfIn PDF document text
    • http://sbcnepal.com/images/file/sexitepa.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/laripoxigomabudojedutuva.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/61373176037.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/muzarelope.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210902164959.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210901165810.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/63954929621.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090907564350.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210912094621.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/24852204311.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/74532788674.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f37fecada---28261323644.pdfIn PDF document text
    • https://paperland.bg/uploads/file/raxejabuximuka.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/57609439428.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/junubalajenimeruruvi.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/45509226448.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/felekifurapesebubini.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/rakixurufiponofonuj.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/72805792170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cuphead+mobile+full+versionPDF 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_off0000df31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 11000 bytes
SHA-256: edebc8ce1267a4d21d08378d42cb7e4a6c60f2e1cc6bcfad37a4a62e21d5d5a7
font_01_sfnt_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 16804 bytes
SHA-256: a456f1bd927f9732dafd7bf08405fab4e970fc66427f1e95c59fb8b2715294e8
font_02_sfnt_off000123dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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