Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbe4853bb00a39c…

MALICIOUS

PDF

85.0 KB Created: 2021-06-08 08:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 78aea8cc951ef89a741f1d4a7f167b1f SHA-1: 452728b02c01112ac1442d684c464c295447250c SHA-256: fbbe4853bb00a39ccf857e89becee74492da9e5eeec93646ac4118bc8d0bd020
186 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 0.9995

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://infrive.ru/pbw?utm_term=todos+los+numeros+que+tienen+como+multiplo+comun+el+20 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495558/normal_602fe29879cd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488329/normal_601baab16e215.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453108/normal_5ffc8c6a77b0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482882/normal_6010670a819e6.pdfIn PDF document text
    • https://pabitunevogozut.weebly.com/uploads/1/3/0/7/130776295/zidud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463810/normal_604c99bd22aa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_604656665cb69.pdfIn PDF document text
    • https://rutujuxifir.weebly.com/uploads/1/3/4/6/134632780/zoxabibefase.pdfIn PDF document text
    • https://fabidarupevonu.weebly.com/uploads/1/3/4/6/134620419/tizotosotedotani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465685/normal_6018b3208c620.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/8ccaa127-2648-4e9d-8856-743c4572573f/22397822980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/595004cd-35ad-4d20-b7d0-3515ffe0697d/how_to_write_poetry_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/188fbfba-0f5f-4df3-82f6-4c520f72025d/zetetic_astronomy_espaol.pdfIn PDF document text
    • http://pejuzor.pbworks.com/f/formulas_de_volumen_de_cuerpos_geometricos.pdfIn PDF document text
    • http://rerikisozid.pbworks.com/f/how_to_use_airline_incidental_credit.pdfIn PDF document text
    • http://gijutexamuwa.pbworks.com/w/file/fetch/144646113/is_a_pregnancy_viable_at_24_weeks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9b12159-48a0-4a97-aa3e-3d9bbffdd947/blue_point_eecr2_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21f2f8bd-09d0-438f-99f4-5d1438d34928/52609955885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce40a766-0540-43e0-9a8f-fe97fdb0b384/d-link_dir-615_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24651aa2-a874-48dc-b5a7-0c3de8228fa7/26809045253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9902fd0-4779-428c-8162-71a98bf0f540/desmos_nonlinear_regression.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/514a7321-5c60-442b-a145-16a0c3589b07/fafogerojisi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F5 5360 bytes
SHA-256: baa21b73568948c0487f7c7a0d0f02d64af164c230c028de2ef688fbfdd3d108
font_01_sfnt_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 12828 bytes
SHA-256: 093f3cf00e343eb0206ed661c13175b684b8496c120c9c0dd908bdb7addb4022
font_02_sfnt_off00012f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5D 16064 bytes
SHA-256: 8407df14a2738efe3d2aaec449fc7b67f888222f7621c5c094f7d2f3a91843ca