Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fbc0b2cb1256e3…

MALICIOUS

PDF

86.4 KB Created: 2021-03-07 16:30:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4a853a32e64b7dc8644cd53920567402 SHA-1: bed7c0e01960b7044777608d0584a0e472bcd8fb SHA-256: 78fbc0b2cb1256e337818efeb2bcfebe71f6977f0f32d5d241b8703023bb3803
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://lozipotod.ru/strik?utm_term=1st+grade+math+frog+yoga+practice+workbook+pdf PDF link annotation
    • http://digovin.getenjoyment.net/93249324915.pdfIn PDF document text
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/vepimijimabajalidur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_603b89cb98f1b.pdfIn PDF document text
    • https://saxeguwub.weebly.com/uploads/1/3/1/4/131406831/tezoso-lawefiduruguzi-gekifovefebapi.pdfIn PDF document text
    • https://lugijuvumefabi.weebly.com/uploads/1/3/4/7/134761930/3986976.pdfIn PDF document text
    • http://nidewopovuwubo.mypressonline.com/is_there_going_to_be_a_season_2_of_tales_from_the_loop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390323/normal_6022ea6ea9717.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/derechos_humanos_en_ingles.pdfIn PDF document text
    • http://bawimip.sportsontheweb.net/zisanoziruvezafogi.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/richard_rorty_achieving_our_country_summary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_70f0ecdb750a453bb6893e477f1fd4c1.pdf?index=trueIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_ed79565157514c07a743432a34eadcdb.pdf?index=trueIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_fa422a30b94a4adc8252398bebf03e29.pdf?index=trueIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_ad8f07586cd04233b4a5c2221d844412.pdf?index=trueIn PDF document text
    • http://liroporuki.myartsonline.com/75465508425.pdfIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_2025aa2e557c464abc07414de7102b72.pdf?index=trueIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_383c2b6b0b2d47e886d9660cfa95c1aa.pdf?index=trueIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_6944744e85124f309435c0a97766d85a.pdf?index=trueIn PDF document text
    • http://tirisesu.onlinewebshop.net/69607635398.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/connect_to_jawbone_jambox.pdfIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_ad4d7d224dd0477c8a4604a9a98b1566.pdf?index=trueIn PDF document text
    • http://molagegivijoxu.onlinewebshop.net/bosilewikoxowenirekexuseb.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_off00011082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11082 5892 bytes
SHA-256: 11d05ba1e06311ff1fbdebef71933eb981fff0b6c51fb44461b583587984c638
font_01_sfnt_off00012486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12486 11856 bytes
SHA-256: bb3b57555d40a6bc6e70c1ce4dab2f806fee96a08632ad7dd824e32835e66f1b