Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf634b3ce27e751…

MALICIOUS

PDF

77.6 KB Created: 2021-03-10 15:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 993414678d135c6837e890ffee7d7b6f SHA-1: 456efc1c94258e074080d29db20c30bba576355e SHA-256: cdf634b3ce27e75166cdcc5f4936b95025ddb80c188bd40bb586c353ff3c333b
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are to suspicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://pelibifir.ru/strik?utm_term=how+to+obtain+funding+for+nonprofits PDF link annotation
    • https://gutirevenomosub.weebly.com/uploads/1/3/5/4/135400373/riniroxatenuvemuwek.pdfIn PDF document text
    • http://prosale.company/wicked_saints_book_review6w2ks.pdfIn PDF document text
    • https://nukimaxirob.weebly.com/uploads/1/3/0/7/130776041/jemebopag_xolomomo.pdfIn PDF document text
    • https://nobuwutuzuta.weebly.com/uploads/1/3/4/8/134884415/tawonesire-zaruxubidebala.pdfIn PDF document text
    • https://burevojaziji.weebly.com/uploads/1/3/4/7/134729690/8511869.pdfIn PDF document text
    • http://topdouche.xyz/magovikidedovrwm4.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/dilupewomu_pikolivali_pupikem_bajudu.pdfIn PDF document text
    • https://katinena.weebly.com/uploads/1/3/1/3/131383377/8275877.pdfIn PDF document text
    • https://gubizotalu.weebly.com/uploads/1/3/1/8/131871644/pexefedus.pdfIn PDF document text
    • https://vufosaxirit.weebly.com/uploads/1/3/4/0/134018891/zilosu_konoxen_gideler_suzov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_b2056fe8778246caa3e87ebec2161f79.pdf?index=trueIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_4b68ecdb7e4a4823b44811493cb2c498.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/53703147492.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/topigeduwutigakudo.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/kavemisatubuwef.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/lugepurugufeza.pdfIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_4aef1ed7465d4ca893a9318c211cf700.pdf?index=trueIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_c589fcb5944148da9acf6d45d0aa314a.pdf?index=trueIn 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_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 5368 bytes
SHA-256: e42f7df02e1ceeacc35d92f6ef2a6a3fd5d8b5b77d46fd048f507ac8d25be0a7
font_01_sfnt_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 10812 bytes
SHA-256: 1432944a219efbfa985d0f0b5d838a92e9f0a8c021361e6f0744391bf0510a78

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