Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f624869fa93080…

MALICIOUS

PDF

74.7 KB Created: 2020-11-25 20:48:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 52b1ecaecf482adf4b5d6a85b28c48f3 SHA-1: 494496a62f4beaac83296fde973fb25b5a8af9b6 SHA-256: a5f624869fa93080f008bf36301748faa95f1429f6c81ba5fb0d88d513bada88
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/strik?utm_term=anime+halloween+costumes+for+couples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f86ffd67a12b.pdfIn PDF document text
    • https://subarijarasojud.weebly.com/uploads/1/3/4/3/134332778/puxugapanik.pdfIn PDF document text
    • https://vafuxukosa.weebly.com/uploads/1/3/4/4/134440110/6334827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454977/normal_5fa65f39d5cd1.pdfIn PDF document text
    • https://vuwapelenepaje.weebly.com/uploads/1/3/4/7/134705438/diwoma_katuburidokej_zosozutogijopuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407571/normal_5f9e44526a8e8.pdfIn PDF document text
    • https://wadazujirala.weebly.com/uploads/1/3/4/5/134596454/6488041.pdfIn PDF document text
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/juwazuvi_zatalot_sukenoxeduma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/43e99447-1e85-4869-bd3a-cacdc9ef71ab/md-11_3d_model_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c36bc0-03bd-4033-af06-070a1f544b16/cougar_run_elementary_staff.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b935db-3e8e-45f4-aa7e-bcd6e93ebcda/guia_para_secundaria_2018.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_off0000e657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE657 5336 bytes
SHA-256: 555cc0b512f0e66f14519609c88729b97b56511ac8ff15c23d19c4af56a3ecfa
font_01_sfnt_off0000f867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 11060 bytes
SHA-256: a01f4263172bcfbfd9c984291daa6aa62255b60fbf0cb0e0a17b4724a2ef6466