Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea30693131f79e21…

MALICIOUS

PDF

82.1 KB Created: 2021-05-01 20:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 88635cad49c12f542f980567266cec5d SHA-1: 0e026ce49302d18ff497ab0ddf4453d5e6028f23 SHA-256: ea30693131f79e21a3149354304bf2aec45e242bed010375b4c9a04a27a8d4ae
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external links embedded within its content. The primary lure appears to be a 'Kingdom Hearts' walkthrough, which redirects to suspicious domains like 'nipisod.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or to direct users to malicious 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://nipisod.ru/strik?utm_term=kingdom+hearts+deep+jungle+vines+walkthrough PDF link annotation
    • https://gitemeloduj.weebly.com/uploads/1/3/1/4/131406811/monezonide_rukixa.pdfIn PDF document text
    • http://zomolejefej.mywebcommunity.org/nufagulow.pdfIn PDF document text
    • https://vekiruwubutut.weebly.com/uploads/1/3/1/0/131070393/8be2a97ec8.pdfIn PDF document text
    • https://vokijovagugudis.weebly.com/uploads/1/3/0/7/130776016/fajigimebojurelileji.pdfIn PDF document text
    • https://jukorupojos.weebly.com/uploads/1/3/5/3/135344641/8c15c21b2e1fdd.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/punctuation_worksheets_grade_7.pdfIn PDF document text
    • https://xijexarara.weebly.com/uploads/1/3/4/0/134017378/b7b3d9aca4eb07.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/ten_knowledge_areas_of_project_management.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/73217631051.pdfIn PDF document text
    • https://pajilolupifi.weebly.com/uploads/1/3/2/3/132302794/8bc2c7d22eac.pdfIn PDF document text
    • https://pifonexivusefeg.weebly.com/uploads/1/3/1/0/131070190/tadesufa.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/wujapu/free_invoice_template_in_html.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2b72b45-870d-42af-84e1-3e9c85468033/the_omen_machine_free_download.pdfIn PDF document text
    • https://78636f1b-f2d6-4e4a-b4e1-07eac4c165d1.filesusr.com/ugd/434c97_25234e9c9c0b4adda178ef271ebb5dad.pdf?index=trueIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_9480d4e07d93478eab93049a35e59d96.pdf?index=trueIn PDF document text
    • http://bememikat.onlinewebshop.net/38344623244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21157388-257c-4dc1-a83d-88dee0d9cc16/2012_dodge_avenger_sxt_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/94916912638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/788b5709-1056-4040-a0ef-ddbe96f739be/lisopuzomulikaj.pdfIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_0c6155d9aadb44c4943b8ef8f06ca8fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/10aa0c9a-dd67-4bf0-908a-b3ca9d458790/82959147099.pdfIn PDF document text
    • https://cbf60184-924b-4e65-abc2-244eb733ec12.filesusr.com/ugd/9a25f9_8091eec1a9ad4623acde58443ffd6207.pdf?index=trueIn 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_off000101a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 5632 bytes
SHA-256: 7030f6df075fd3a502d9afa744a384e5614ff7d403a85aa35c3d832622dbe05d
font_01_sfnt_off000114bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BB 11096 bytes
SHA-256: 04ffccff512839bb9078c4529cfee0f3e0fab5ba64c580f9ab255e3b50d12c3b