Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d844a9f6be02dc…

MALICIOUS

PDF

78.9 KB Created: 2020-11-17 15:16:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4510c55612497ad6afc74427a69daedf SHA-1: de4a6d428f7a12537258c5a3e19085e1658a87f6 SHA-256: 91d844a9f6be02dcfb412f22466f9dfd6c1f22521f9e8d0077d73313ea1257aa
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 0.9998

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://trafffi.ru/aws?utm_term=bipartisan+budget+act+of+2015+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387582/normal_5fa2678356d8d.pdfIn PDF document text
    • https://velulaganivuvoj.weebly.com/uploads/1/3/4/4/134438708/jifugolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389127/normal_5fa180cf1f991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417129/normal_5f9693a86adbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404757/normal_5fa3a6510e1fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5f9ad4745e079.pdfIn PDF document text
    • https://buluzuzumaz.weebly.com/uploads/1/3/1/6/131636727/7593995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_5f941b679acf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414167/normal_5fab61971f8a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f92601fa8afe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420747/normal_5fae2f236289f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_5f8c54a233f1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ditiruz/juan_de_pareja_the_calling_of_saint_matthew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a550446f-ea69-488f-b027-cd131e2b404c/english_grammar.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/refigodutobexexax.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 5928 bytes
SHA-256: d073fef5f1b95092da8b1d07aafba3d91bdfd160cd419e8eca12ae8810ccfd88
font_01_sfnt_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 10540 bytes
SHA-256: 77d4a262c03e4d1cdcb145141c90486269ed2e0f59b73e5d097b29fbc1449eae

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