Malicious PDF — malware analysis report

Static analysis result for SHA-256 6519daeaed6367f5…

MALICIOUS

PDF

74.1 KB Created: 2021-05-25 02:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1df09309d5081680fdf7f9aae70c3594 SHA-1: 11e4fd7641a421af73e03cc23a4874e98e49511d SHA-256: 6519daeaed6367f529b84282e527314e62084e068964276b83bc408f5c975cdc
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 link farm for SEO purposes, which is a common tactic for distributing malware or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

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://ponafet.ru/strik?utm_term=esc+heart+failure+guidelines+web+tables PDF link annotation
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/16b674e0.pdfIn PDF document text
    • https://gilepinewuje.weebly.com/uploads/1/3/4/0/134096317/nalerob_nezakamus_dapides.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_6034d2ea9e16f.pdfIn PDF document text
    • https://robugagemo.weebly.com/uploads/1/3/5/3/135304688/dilatizetukaxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369796/normal_5fee53307bd98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373527/normal_60374eb53319b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455174/normal_5fce94f7f0a6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370555/normal_600226e22d980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407306/normal_605ad61b6669f.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/vukujidor/kukilepagixi.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/romikoduzitogubonog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/948b0e62-3fc5-4d2f-984c-38b727b6aed5/98965339245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4582d7d6-0492-4757-900b-8d71370547f6/45281389210.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/pentair_intelliflo_variable_speed_ultra_energy-efficient_pool_pump_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d566dbed-9945-48be-91bd-e6216ca27b75/product-type_divisional_organizational_structure_advantages_and_disadvantages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9e4706-8c5f-4c02-b1a4-38d4da982d93/iowa_penal_code_708.1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19062fb2-dd25-44aa-94bd-12f0aa54ea93/how_much_do_junior_interior_designers_make.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/dna_structure_worksheet_coloring.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/maven_setup_in_eclipse_for_selenium.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_off0000e303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 5472 bytes
SHA-256: c36f05f6c1b62bdb7610a3eee114ae0eb3746b9ceefd73f52a20ee7b5c0187e1
font_01_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 10796 bytes
SHA-256: 28967d54a2a4464f5a20c7c264228dd9577dc54946ed707361fd40ebd042d3c0

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