Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef81b0072e2067eb…

MALICIOUS

PDF

87.8 KB Created: 2021-03-22 11:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 161a3992c54e0d796368bd0640fcd653 SHA-1: 33da8eeeffa1cc4da1c9f7fd0f73d4ed5d11e25c SHA-256: ef81b0072e2067eb0a5cbf4e898dc1d5c586979cb7296f9bfc865e88cfd1e75a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gimoguvi.ru/wix?keyword=severn+bridge+half PDF link annotation
    • http://rawitotizoxuk.scienceontheweb.net/list_of_ayurvedic_colleges_in_maharashtra.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500429/normal_5fc9ab39f12ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469358/normal_602e669eb0edc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491414/normal_6003b93919923.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/fXxqjg8/27287120386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455376/normal_602dd0766d12d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413986/normal_5ffb44282fada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449422/normal_5fe2f88eab2c3.pdfIn PDF document text
    • http://nevinidonet.mywebcommunity.org/relusudifip.pdfIn PDF document text
    • https://cdn.sqhk.co/gazegarov/he85icS/86495586799.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_3699b5d4e4674e0fb322ccfd2ef94050.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39efd214-7b0c-4fd7-ab26-d51f6318a1da/what_is_importance_of_technical_writing.pdfIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_025a67d035814325ba478e623525eff3.pdf?index=trueIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_248cff959dd54dcc8546a59a9d0f61f5.pdf?index=trueIn PDF document text
    • https://4fd47d7d-96cb-4cdc-943f-55997d715fc9.filesusr.com/ugd/ab3424_9bb083a15b90477482cf5f26f7cacdcf.pdf?index=trueIn PDF document text
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_6b54b61c8e2346b482eb36ca37b0165c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c793b114-8011-4af0-a353-11a9b914a097/86323480406.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 5292 bytes
SHA-256: 903db14d9cef127bb67b480f2e69c35b3d013e7b74b0556290db67b7d9d042c4
font_01_sfnt_off00010848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 4916 bytes
SHA-256: f283f192e86b76864bde9f3f4f62183ea6b2762573e84e8e36fbaa0cc4d6b147
font_02_sfnt_off000115c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C4 10916 bytes
SHA-256: 4f00eaf0dc67fe0bc62a51f63a0a251eff8b56774ba5d2cda28ae264f035d044
font_03_sfnt_off00013b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4A 16396 bytes
SHA-256: 20f75f4706e0626d2024322c375b72d0262d3f579647f3e792bca13731f8a889

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