Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cf9893338f0e2e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-09 18:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 43d8c8e5daa184c2bb3f4f9f3373dc44 SHA-1: 8f7dd1f8c7b5fdce504a9cb28a5c4d800f127a98 SHA-256: b7cf9893338f0e2e1b3b53796c6de09778f16a29344a7bb0229f5972efb7ce09
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://garglob.ru/uplcv?utm_term=best+fruits+to+eat+for+weight+loss PDF link annotation
    • https://taiwan-tiaya.com/upload/tiaya_official/files/90258351912.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/digatexuvotuv.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/57287826740.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/62738594285.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/gepil.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/27015798951.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/legebuxozenalawuz.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/93769153168.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/duruwifudoxipuwusip.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/badufitutitiri.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/fuxuxi.pdfIn PDF document text
    • http://airsoft1.ro/files/file/2722065883.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/71806836720.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/kodudupeselirim.pdfIn PDF document text
    • https://aneri12.eu/res/file/4099371260.pdfIn PDF document text
    • http://guowangcable.com/d/files/mijoku.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/41988725724.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/5242252093.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/mekijezeveto.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a26e8b083---36723121987.pdfIn PDF document text
    • http://come2menorca.com/images/file/90493957175.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_off0000b4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD1 10628 bytes
SHA-256: 5dc1b1a362c7f1e51f0592bfcb086195244ae4e74d6db9a9381ec7051969fa3e
font_02_sfnt_off0000e563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 15152 bytes
SHA-256: 6fc12a2377545a9bc31bb942e17ecdc0e3e6b06057e72ed2716e8b4ae6fb1f7e

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