Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1e9d949d165195…

MALICIOUS

PDF

77.4 KB Created: 2021-05-18 08:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: de006e6b9bcdebeb56c64549ca74dd8c SHA-1: cffedc816f1ff1f1de4ebcc3705b276a78b73dfe SHA-256: 4a1e9d949d16519528a3147bb2d60574d817bee8833e972a0dbe8f3d19d97d11
126 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, including one pointing to 'jacksth.ru', which is likely the destination for a phishing attempt disguised as search results. The document's structure and embedded links suggest it's part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://jacksth.ru/strik?utm_term=melhores+restaurantes+em+atibaia+sp PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420030/normal_5fda7f8714dd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485826/normal_5fc66b827a021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414848/normal_605c411a91fc7.pdfIn PDF document text
    • https://vomukefepa.weebly.com/uploads/1/3/1/8/131872153/febigota.pdfIn PDF document text
    • https://pedigibija.weebly.com/uploads/1/3/1/8/131857049/8471801.pdfIn PDF document text
    • http://bodegumuxizobi.22web.org/8050497901.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384644/normal_5fcce6ba242eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456728/normal_5fceb20da73af.pdfIn PDF document text
    • https://murunabijijot.weebly.com/uploads/1/3/5/4/135401069/11d69a2db18a147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450724/normal_605c13e640dad.pdfIn PDF document text
    • https://rojomitalo.weebly.com/uploads/1/3/4/4/134485393/700878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_605c6443d56ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401692/normal_602db54e5a7bf.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/bbf59146-cb5d-4ca5-a0a9-51d4813368fe/zinizut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d54580f-7154-4780-ac24-1c07dd7d17c0/how_to_become_a_mandalorian_swtor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f3cce1-38e7-43d8-b464-0b31283ca2be/skyrim_se_ultimate_combat_load_order.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/winnebago_industries_customer_service_phone_number.pdfIn PDF document text
    • http://gemunedipu.rf.gd/excel_vba_range_select_cells.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/guwomazevovom.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/baposedegokerefiwibivame.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_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 5204 bytes
SHA-256: 54987478dfe84aef2efa69384f85b371c02cd23c37d5f379db906571adf58baa
font_01_sfnt_off0000fff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 13048 bytes
SHA-256: 3be410f60c0c9ac127728d4b9fd7b6646eb1c6fcb1fd619657ec52b98836c0d3

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