Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bee7244f6d537bb…

MALICIOUS

PDF

76.7 KB Created: 2021-03-27 18:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 584badfb13664c0bb12f7da1f1e5912d SHA-1: 6dbde9725af032000feb40af539343f396ffe591 SHA-256: 9bee7244f6d537bba29f4dfdaa8d9c6712ff572209d1e33430dcee4189c2b64e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly indicate malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or malware distribution scheme.

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://bologen.ru/wix?keyword=fraction+to+binary+algorithm PDF link annotation
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/dobagudu_visujififosuga_xavadumowi_fiperikewub.pdfIn PDF document text
    • http://zijafanovidiz.sportsontheweb.net/xiratobamexisujoxeviz.pdfIn PDF document text
    • https://nosovaranipad.weebly.com/uploads/1/3/4/7/134743093/gawid-xenal-zivekabifamete.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/vubepala.pdfIn PDF document text
    • https://tajezutudod.weebly.com/uploads/1/3/1/3/131398094/630068db5ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_603bf0d17dd35.pdfIn PDF document text
    • https://losaburi.weebly.com/uploads/1/3/5/3/135322327/6185724.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407784/normal_605850bd0d512.pdfIn PDF document text
    • http://vobajujabu.mywebcommunity.org/ayushman_bharat_offline_form.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/nazufipatob.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/kufazete/pejalipagef.pdfIn PDF document text
    • http://tosipasakuvil.myartsonline.com/fenilotilepis.pdfIn PDF document text
    • http://vakogez.myartsonline.com/teacher_appointment_letter_with_terms_and_conditions.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/abdellatif_laabi.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/medical_informatics_journals_impact_factor.pdfIn PDF document text
    • http://guseboses.atwebpages.com/zularawaxagis.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/what_does_strip_mean_in_las_vegas.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/vuzomukufesunevatonegobup.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/malofuvaravo.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/nodirijiloropijo.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_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 5232 bytes
SHA-256: 4e3c0c67cec2c3baf02a2fbad1dc7d5812cb6ca4fbe3ca3d00a3cb4e2480cd4d
font_01_sfnt_off00010169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10169 10536 bytes
SHA-256: e38346da5380e20c28d97c3e35e142fa659ae086aff907b15caef6c788de6d59

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