Malicious PDF — malware analysis report

Static analysis result for SHA-256 3372b1d7d7d0bd9d…

MALICIOUS

PDF

77.3 KB Created: 2021-04-29 13:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 49102a36c7ef8d3ca5141d49bd2086c9 SHA-1: 2c95b754f4ebdc6d5bc4a0776babdbe243b551c4 SHA-256: 3372b1d7d7d0bd9df800ab348504803b69cfeb16e74e0b5a729d3b1a430d9133
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL leading to a suspicious domain. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The embedded document body, though partially corrupted, mentions a diet plan, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=dieta+alta+en+grasas+y+proteinas+y+baja+en+carbohidratos PDF link annotation
    • http://peskomment.ru/89983015337ps7i1.pdfIn PDF document text
    • https://kawutakupilim.weebly.com/uploads/1/3/4/2/134236314/ruvuwesiji.pdfIn PDF document text
    • http://hellochildren.online/litezadojiluniv7r5c.pdfIn PDF document text
    • https://leditolovon.weebly.com/uploads/1/3/2/6/132682688/bofisexetele_xivosulegu_susevatakanar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_88dcd316ab734a4ead340330d5db7c02.pdf?index=trueIn PDF document text
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_10e39ee9954448c282393f65c575d9f0.pdf?index=trueIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_b0b5da6e2d884d769d991b2252d7589f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/98129647249.pdfIn PDF document text
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_d56e7552a687423ea31af147e236545f.pdf?index=trueIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_f42243ec7afc48caad62cf408d26780f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/pudetadenobuledafoma.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/constitution_of_china_articles.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_9493319bbfc3475e8e9a1bbbe6436bcd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/math_worksheets_for_grade_6_multiplication.pdfIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_946bb3f3baea43269d9d13018e7797e1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/5861353129.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/34291361230.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/19908256942.pdfIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_fa41e655e9fe47319147c8b53f532617.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/cardiology_a_practical_handbook.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_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 5652 bytes
SHA-256: 7b14c9cada2aef73f39acacd5593842e54dfa2df9183c25180c01797bd6d6180
font_01_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 11576 bytes
SHA-256: ae157f5bc9b3bc588d84f06ba661d8b6c401bbf57bc8a24e44ca8aaaeeff5194

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