Malicious PDF — malware analysis report

Static analysis result for SHA-256 f358e2bb85b19335…

MALICIOUS

PDF

72.1 KB Created: 2021-05-19 03:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 53c74f5de4b2c7decf4800db01e1a0aa SHA-1: 602638c3930e4244f6faf533312323ebd15ca86b SHA-256: f358e2bb85b19335df5541d4bbc2e718d28a3617fe319eca7bd3d58725e03792
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the 'PDF_SEO_LINK_FARM' heuristic point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/strik?utm_term=carpentry+measurement+worksheets PDF link annotation
    • https://pesenulowujef.weebly.com/uploads/1/3/5/3/135325158/6f113b660226.pdfIn PDF document text
    • https://sefatepasegul.weebly.com/uploads/1/3/0/7/130775173/a2020085.pdfIn PDF document text
    • https://mekuzawejonoma.weebly.com/uploads/1/3/1/6/131606345/zetebezosifu.pdfIn PDF document text
    • https://vugevosuza.weebly.com/uploads/1/3/5/3/135328642/gudefujuw.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/5fd1f234ff.pdfIn PDF document text
    • http://tiboxul.iblogger.org/abc_s_of_calculus_volume_2.pdfIn PDF document text
    • https://fadexawotizetav.weebly.com/uploads/1/3/4/3/134339615/retedutomokixusoma.pdfIn PDF document text
    • https://fekukutetixamam.weebly.com/uploads/1/3/4/6/134636283/792907d6c6e.pdfIn PDF document text
    • https://senajadodum.weebly.com/uploads/1/3/1/3/131379015/740eea86a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://papixunaz.epizy.com/pathfinder_kingmaker_weapon_finesse_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/distinctly_home_400tc_cotton_sheet_set.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/sawejotoluzujekaxupebi.pdfIn PDF document text
    • http://zedagemutumus.rf.gd/slope_protection_methods.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/77975692270.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/ssd_format_ntfs_allocation_unit_size.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/67299431897.pdfIn PDF document text
    • http://kewivifonawati.epizy.com/79398602942.pdfIn PDF document text
    • http://nezatexefig.epizy.com/como_puedo_ser_un_buen_lider_de_jovenes_cristianos.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/senibi.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/tonufijad.pdfIn PDF document text
    • http://xuvabome.epizy.com/22117908932.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/lab_equipment_activity_worksheet_answer_key.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_off0000d9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CA 5192 bytes
SHA-256: fe030f23149041c126dd4527fae4ff8532c9beaa3d3097b55e4ff279412b7131
font_01_sfnt_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 11028 bytes
SHA-256: 491886f7663786c9eea79e88d6a1ddebc63cfa95b020e7be33f845859c540dab

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