Malicious PDF — malware analysis report

Static analysis result for SHA-256 0019f4179b1770f5…

MALICIOUS

PDF

72.1 KB Created: 2021-09-10 08:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: d69ad2e01797629c043a9d0c9b52ab80 SHA-1: e38b7bc7b492a5c9e49e2cdf90aab09f3be50e16 SHA-256: 0019f4179b1770f5a392c8ff3ab40906e5d52adb5d5bef0368244573c41f9cc4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=deep+learning+thesis+pdf PDF link annotation
    • http://eapver.com/upload/ckimg/files/202109100733171182.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/kunemuvubumevox.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/62800463688.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/f90v3kh9d5l8bgku7ajgmkn3e5/86977003848.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/27450647243.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/zebowejurasibanuxa.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/83765281555.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/jowiz.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/dijiwokopowowadebabevet.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/64111502725.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/17322265180.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/sepunupukirav.pdfIn PDF document text
    • http://kgmda.com/upload/files/weruwadigidudowax.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/liluw.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/65296828316.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a141656b84---rawup.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/baniro.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/79511229469.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/nunivotifitowafa.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/daraxilolaralireja.pdfIn PDF document text
    • https://invest.pl/userfiles/file/54905866397.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_off0000bb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8B 15664 bytes
SHA-256: 2e9941d61b5e74940840b19f39a65c60c031aa9071d1e723cc70edab880fc553
font_01_sfnt_off0000e33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB52 10660 bytes
SHA-256: cac3113b02820ab8c043170ffd1361c4b6d30c0cfd8166afdb66150a93e13efd

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