Malicious PDF — malware analysis report

Static analysis result for SHA-256 212ef1b9a4df0faf…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 03:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 165ccc8d479db3e25d89c1e2f0c4b577 SHA-1: e631ea3ed42310940acfb3a910b6321acf1e1b1a SHA-256: 212ef1b9a4df0faf5e2e3a5d75292fad3bf4b3d72821797b70fcaeac372a6910
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document contains numerous links to disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest an attempt to direct users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://vetcasatenovo.it/userfiles/files/ruwemumozosokolepe.pdf In PDF document text
    • http://gidromall.ru/img/uploads/file/53109385705.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090210024973499.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/81506701971.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/89342522205.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/55100277237.pdfIn PDF document text
    • https://kiptep.ru/file/tevaw.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/sipapikibijopabilabi.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/50979792242.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/netujukitesigofotuzaj.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/64549724358.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/18946763779.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/83l63pem05gvhovqjabnpo98p5/96627111808.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/gopuvufam.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/wukipozuxififolukow.pdfIn PDF document text
    • http://grupophi.es/uploads/files/riwusuju.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/sogamolatorugafubu.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/gidagevodirogegodef.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/10639761182.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8343ce172---lovovivusut.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/83851155784.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/wevijudumixud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=nexus+6+custom+romPDF 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_off0000d62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62B 17796 bytes
SHA-256: c47962135949133d5a0efc6337dfc8abcde774d49995f49cbb24bbfd271827b1
font_01_sfnt_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 10332 bytes
SHA-256: 49e07111fd52cc3727722b78ece9f005d49ee6906246282659fbff6f67346270
font_02_sfnt_off00011bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1