Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8ef94ce793c024…

MALICIOUS

PDF

71.4 KB Created: 2021-09-09 12:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 854a2b9ea724a08ab39588b768f9021c SHA-1: 06ed8c0385d79cc6495d2afe9cfe6acf4043b741 SHA-256: 0c8ef94ce793c0243b5637f35f80505f2de8eee11b1fa9f58640880d2d19537d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure point towards an attempt to exploit users through deceptive web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://neurondevelopment.org/userfiles/file/bebutabafefanumixesuva.pdf In PDF document text
    • https://avela.md/userfiles/file/zizinukibozezol.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/44086865593.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pupuzofavosenagozofuter.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/forivizunuzavamibowolow.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/75074428541.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/f79d8214797fe8f6a6b615db2cd89195/9441125329.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/48870963286.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb2cd5b28---60738778717.pdfIn PDF document text
    • http://orenprom.com/img/account/file/libel.pdfIn PDF document text
    • http://123dvere.sk/files/file/30397710011.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/judubabubasobapan.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/3991734525.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/fifoxezebuk.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/13178296181.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/65360050728.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/14784844651.pdfIn PDF document text
    • https://ratosatu.com/contents/files/14907844391.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/1037886803.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/12182271190.pdfIn PDF document text
    • https://mihalex.by/files/files/66385548917.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/xomovavijewomoxolevevas.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/59167536458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=memoji+app+for+android+free+downloadPDF 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_off0000b589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB589 16664 bytes
SHA-256: 89dc097872711b5297051da61ada6436fbb915a8dafe087434d9394bdf52217b
font_01_sfnt_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 10604 bytes
SHA-256: f940645b1e6dc0568473373517ff377139c6ea2e0199184e0f508849c8fe9146
font_02_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1