Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3396fcfaec81d55…

MALICIOUS

PDF

67.6 KB Created: 2021-03-18 21:33:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4cf76a3ebafdfdd189204f3e68233012 SHA-1: ec0bd03f73666809a86e4ea92a5cabe701553bc9 SHA-256: b3396fcfaec81d55b9ff2f4d134557394a3aba40fd8f5792dbc9ba8f9c4dd081
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the PDF structure point towards an attempt to trick users into visiting malicious sites under the guise of providing educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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.
  • 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://ponafet.ru/award?keyword=cambridge+primary+mathematics+stage+4+learner+s+book+pdf PDF link annotation
    • https://vafebukuwu.weebly.com/uploads/1/3/1/1/131163563/firuna_bokarivurosu_zinowudepomiga.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/animal_kingdom_florida_map.pdfIn PDF document text
    • http://tiktokhd.design/ganuba7mt7.pdfIn PDF document text
    • http://ijmalan.xyz/how_much_does_it_cost_to_fix_a_vacuumd8ox1.pdfIn PDF document text
    • https://kizutinapetesod.weebly.com/uploads/1/3/4/4/134490845/2316417.pdfIn PDF document text
    • http://wamabivunufoteg.medianewsonline.com/apache_jmeter_tutorial_for_beginners.pdfIn PDF document text
    • https://bafuzonexive.weebly.com/uploads/1/3/0/7/130739369/lobobafuzakesedelojo.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/piwanisaj/hbase_vs_cassandra_write_performance.pdfIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_945ea6d9521344a39b3acc79b5cf0395.pdf?index=trueIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_c6dec31ae6a34bc0b99bc8310adac324.pdf?index=trueIn PDF document text
    • http://piwolimosopobu.myartsonline.com/ascii_value_python_table.pdfIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_868828f7488e49d5b632c373cd57301a.pdf?index=trueIn PDF document text
    • http://mafojupovovod.rf.gd/fekozoxuvo.pdfIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_fa9d1a6c90694d65bb7d21f61b829f6a.pdf?index=trueIn PDF document text
    • http://wevikokuzufos.epizy.com/61674955329.pdfIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_7058c75028784e9aab380723a539a240.pdf?index=trueIn PDF document text
    • http://wajatapewob.rf.gd/vizakot.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/wuwavamunovekimolozolaweb.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_off0000c901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC901 5868 bytes
SHA-256: 8fa7efc99b30dff7514b496ad7aeeae9315f0b245361d0b4fb9e8524613991c9
font_01_sfnt_off0000dcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD5 10468 bytes
SHA-256: 8a0961fc6246f2b2c4bab13fb522a6b8c586a5b42af93e4964d70defc54f4907

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