Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fda85560c973ec…

MALICIOUS

PDF

74.4 KB Created: 2021-09-17 11:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 54b159a1090835f13b6294e8a80dd737 SHA-1: d862a3231d37e9817685437539ac5ba39ec50da2 SHA-256: d8fda85560c973ecf9b190e7eb8371aed8c0d1129e3311f63938eddb17f48789
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://archism.ru/uplcv?utm_term=boku+no+hero+watch+online PDF link annotation
    • http://kolaykanal.com/userfiles/files/81809778900.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/fezegamuvisuve.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/77077839763.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/51017858682.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/susolemivalo.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/rugomomoxavadapadude.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/11968174091.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6c6de4aa1---46927667834.pdfIn PDF document text
    • http://sdes.in/uploads/fexadamuxuset.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/85767207553.pdfIn PDF document text
    • http://labradory.pl/file/7288126888.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/80428238162.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/saxibovujipafadaz.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427a841ef96---tesafalutigavidaxanivedes.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/jadig.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/39991152036.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/72891865951.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/parudakesedidunaneve.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/vibufomada.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/gogokixi.pdfIn PDF document text
    • https://ibericadearmerias.com/file/gijajafafuratifekegev.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/45969552917.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_off0000c141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 10492 bytes
SHA-256: 931920f42c72e8b6d0a99ec9e997f29488c6b1f59557f81aaec1d458c1757252
font_02_sfnt_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 16756 bytes
SHA-256: 5813f7174e7a2de24514664987334a90adad8e57dd7fdfff555955bf70a5aba1

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