Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b5a874842c2cce…

MALICIOUS

PDF

90.3 KB Created: 2021-04-07 10:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 650ad6cb3a95d096564a20b88e11ffb0 SHA-1: 812c5f6c9a907d3279a56f48233f782b8bd76d74 SHA-256: 89b5a874842c2ccebaff3327752b116d5d28ec71aeaa29acf04c48ffe3d68eb9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection strategy to host malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=msi+gtx+970+gaming+4g+ebay
    • https://static.s123-cdn-static.com/uploads/4480588/normal_5fc9b6a6d82f3.pdf
    • https://cdn-cms.f-static.net/uploads/4461751/normal_60281591cd9ba.pdf
    • https://cdn-cms.f-static.net/uploads/4485799/normal_6059d5c535225.pdf
    • https://cdn-cms.f-static.net/uploads/4369773/normal_5fd3bfe80c8f2.pdf
    • https://static.s123-cdn-static.com/uploads/4465394/normal_6008c69f7313d.pdf
    • https://cdn-cms.f-static.net/uploads/4403824/normal_600bb4edba0ce.pdf
    • https://cdn-cms.f-static.net/uploads/4420752/normal_601cbca7487b6.pdf
    • https://cdn-cms.f-static.net/uploads/4494433/normal_603831fab5e68.pdf
    • http://fikipasofesopem.22web.org/vadaxojititakuzulizivav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ed96128a-f3f6-412b-a4e7-87a2dc61891c/11763807983.pdf
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_42af8ab940b343cc9d3a32af865fa345.pdf?index=true
    • https://16dc6c2a-32e3-4a69-9eea-5b59d93654f8.filesusr.com/ugd/176c29_6ebdb0f1166c4de48f02d346c1e8f384.pdf?index=true
    • http://binuxoxu.rf.gd/learning_styles_articles.pdf
    • https://uploads.strikinglycdn.com/files/2d2c7935-1627-4690-b5d7-f206d1906334/rutusegedadafibupudej.pdf
    • https://uploads.strikinglycdn.com/files/5271384e-3b73-41c0-9859-c21a4f0e3ac9/11812458212.pdf
    • https://uploads.strikinglycdn.com/files/1fbeba54-538c-481c-b1f3-e9dc1313423f/58310255401.pdf
    • https://uploads.strikinglycdn.com/files/db4983f1-00ec-477f-8a62-6b966199aaaa/wunofaxomonekak.pdf
    • http://nogurinuzelajer.rf.gd/sat_reading_and_writing_grading_scale.pdf
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_f7283391e1314381bb2b200f124d6d3f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/97e27832-6ae8-412a-a9f0-b3c4fed0d7b8/21395310022.pdf
    • https://uploads.strikinglycdn.com/files/16e56bd0-1d76-4f5c-baad-f2834dc37754/53605467525.pdf
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_a6e824b6639b49c387e0166dffb1ac16.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9e68ba82-ee95-4738-9175-3bc97160cfbe/rasusasenenukapuw.pdf
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_49f6aea6ae224b88b5e0c97bc2655757.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121fc.bin
e9f25bd1d8c53924b31dcefd9540fcb66b882976e3a11e548519ff29eab356a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121FC 5656 bytes
font_01_sfnt_off00013552.bin
a86fe4664784c7ba52db533ab9a1d455067071917bd8b658ab988189d4108e71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13552 11164 bytes

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