Malicious PDF — malware analysis report

Static analysis result for SHA-256 e535a9a1e6f0e4a4…

MALICIOUS

PDF

83.3 KB Created: 2021-03-09 10:59:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: e8672faf30819a821181129d33708d49 SHA-1: e9d412ead12aa8b3bd32597254dd763857223768 SHA-256: e535a9a1e6f0e4a45826bef637005222c7a4559517cc5e8ed121e2c59247dc3d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/wix?keyword=claviculas+de+salomon+que+es PDF link annotation
    • https://xikalevu.weebly.com/uploads/1/3/4/3/134319979/1372948.pdfIn PDF document text
    • https://wazivako.weebly.com/uploads/1/3/0/9/130969042/726cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_5fe9fa5114ab1.pdfIn PDF document text
    • https://lebivituwaw.weebly.com/uploads/1/3/1/8/131856954/06d77684c86dd6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408713/normal_600e76074cf44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468550/normal_60248d5eb4ff1.pdfIn PDF document text
    • https://wapilumavazari.weebly.com/uploads/1/3/4/4/134446451/zateriwedexumoxamaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_603540168c05b.pdfIn PDF document text
    • http://tideparipawovu.mygamesonline.org/puxanogeriti.pdfIn PDF document text
    • http://jefuvumerusew.getenjoyment.net/jj_benitez_caballo_de_troya.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://benamow.myartsonline.com/suvigusitavejonimakel.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_c55af347b09e47ed87c3f51953be1452.pdf?index=trueIn PDF document text
    • http://pudosuvosav.atwebpages.com/simplehuman_tension_pole_shower_caddy_instructions.pdfIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_4155d70281024bae95a67ae9a787e043.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fukepez/meaning_of_balance_sheet_in_business_management.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/16459641947.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/plant_biotechnology_reports_manuscript_submission.pdfIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_b8fccec1e4354693927fcbfe0319fba5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/77779675119.pdfIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_cc0f3fe863194195bc74cdade9f9db45.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/android_sdk_unity_hub.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/ms_excel_training_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/cicada_life_cycle_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 5000 bytes
SHA-256: 1c80e97bf66a548acaff27be3585c9a99b67cfe4345846e55e43aa4e95a36515
font_01_sfnt_off00010608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 13328 bytes
SHA-256: 2f4871e84486cfff60d6f042353c9a8f4ccabe02c107dfe94b6e384b5a5d9946
font_02_sfnt_off00012f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F98 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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