Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec88285b159c5522…

MALICIOUS

PDF

77.2 KB Created: 2021-03-25 16:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0cde4804b921648482fa4e86649ae03f SHA-1: e4cd64f8b4250f66ffde439f0a7d64ef9a198444 SHA-256: ec88285b159c552206f0df66f314f64493257d9a2a5e5ce1f0fdaecbef563aa0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary malicious URL identified is https://jumiwimov.ru/award?keyword=air+force+x+group+sample+paper+pdf, which is likely used for phishing or to serve a secondary payload. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/award?keyword=air+force+x+group+sample+paper+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367640/normal_605c91c62e8c2.pdfIn PDF document text
    • https://zaxefuki.weebly.com/uploads/1/3/5/2/135299090/1182c1e.pdfIn PDF document text
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/vatoduxoxifofegukaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391649/normal_5ff80b2572e9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449602/normal_60563d667d776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446270/normal_605c9a0e11dad.pdfIn PDF document text
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/2375874.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_3cf98deaf4b041c3a1063b6755aee2be.pdf?index=trueIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_07354537e3e9462a9e1106d769944430.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davawina/nuwemirenemulepef.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/suvijogibonozusobumo.pdfIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_f419140702544b09bee73dc3908a5aed.pdf?index=trueIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_f1a8c593036c4d3ebeb5e3c5ad7e84ba.pdf?index=trueIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_4f24c156c8324bf8880cc79074fae27f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxunaf/17383183654.pdfIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_a686e7fb09b3464482991c97c330ee42.pdf?index=trueIn PDF document text
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_5e5e6c1d8bc04c8e8075945b1524ecf3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d26a4f6f-bdf3-4e2f-84e3-beec13cc5ea4/xapudav.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/95361154502.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/tetotulixamakuxebigupog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ec8da6-f9e1-444b-a503-58db20e9f5ea/bodas_de_sangre_resumen_corto_del_libro.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_off0000f2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 5532 bytes
SHA-256: 9b1b4e156d481e2399343f79029f7c9de67d082fd77f8840306f95f9450bdd1b
font_01_sfnt_off0001057c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 9988 bytes
SHA-256: 6249e6a7914cd95030e1aa73c82d7de87bbc1d26f6a0c1e6601408e6b5557d8d

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