Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4184b287d13c3e…

MALICIOUS

PDF

87.5 KB Created: 2021-09-08 18:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 13d4100e3e91b224207519c989ecb964 SHA-1: 06d458ec5c984ec0842b2be5684cc77eddf3df04 SHA-256: bf4184b287d13c3ef34b79f157531c57ccf5dd18355258b5d80238c50bd9fdac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution campaign. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The PDF structure and embedded content suggest it is intended to deceive users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://btcauction.vn/hinhanh/file/82263698620.pdf In PDF document text
    • https://arichaindia.com/userfiles/file/50628589376.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/winabiterinefoxun.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/12570962590.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/26829969201.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/66417123098.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/ziruruxezaximuj.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/13524789148.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130bb3184382---67567674414.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/49591866704.pdfIn PDF document text
    • http://decaiyun.com/upload/file/21090816385694104981insir4d672.pdfIn PDF document text
    • http://tulga.ru/editor/files/kewogagulogikidonuwemub.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130516e24bc9---xevupojujadokazojisewiwab.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/34689390407.pdfIn PDF document text
    • http://myslizdrave.com/soubory/15692369504.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/wavuxixufuluramodimofube.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/48347517204.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/91633359348.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/18106588532.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/97477178288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=arabic+language+grammar+book+pdfPDF 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_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 25724 bytes
SHA-256: 1e12b2bfd1d97dfe8e143687bb1a89c670cb43dec693ce6657618c54ebafc4e2
font_01_sfnt_off00011f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001374f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374F 11008 bytes
SHA-256: 1c33fd51c16fef87b7ea39b93452a9f47a26351230538a14ba2f53ac4702abc3

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