Malicious PDF — malware analysis report

Static analysis result for SHA-256 384bbcba0d540fb0…

MALICIOUS

PDF

77.1 KB Created: 2021-06-08 01:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 04a0464a20ffa4df9a584a26503b68dd SHA-1: e5a2bd275b40a44d3da143c8354c2615f03657ce SHA-256: 384bbcba0d540fb0f4717409f6517f430f462b157302a284accca40e61b4673d
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it functions as a link farm, directing users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://crewmak.ru/pbw?utm_term=eastlink+basic+cable+tv+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414339/normal_5fffd84cb2d7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474457/normal_601fcefab8897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451954/normal_606e25a94d65c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476416/normal_5fff7ab818e01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418192/normal_6000c162931eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375352/normal_5fc9834e1bdb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471479/normal_60be935064e48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475989/normal_601675dc281da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451766/normal_5fceba1abd9b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387230/normal_605f3d01ecd0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387932/normal_5ff2146a77c83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jetubabup.pbworks.com/w/file/fetch/144613788/rapport_de_stage_banque_socit_gnrale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a59579-696c-45ae-9c31-5ff8c99fd826/which_religion_is_older_christianity_or_judaism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ea2e13-55bc-4473-a8ef-da319e21360f/gandhi_autobiography_book_name_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e4cfcba-f5b5-4632-8c15-effe4a6966e1/pusubusotox.pdfIn PDF document text
    • http://pidexuxok.pbworks.com/w/file/fetch/144582717/empires_and_puzzles_hero_ranking_spreadsheet_2021.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/w/file/fetch/144517977/livro_louise_hay_grtis.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144412404/kaletajoruduwaxotekego.pdfIn PDF document text
    • http://kejuziz.pbworks.com/f/94848824955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32852ec3-cb83-4fdf-80b1-9dbececf8e5a/13071903534.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_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 5232 bytes
SHA-256: 088017eb20f40f302f7438a59740cbd6f27f778677d5d1195628d6992cb31fb4
font_01_sfnt_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 11048 bytes
SHA-256: 24884f42de0bc9afcdcafcbdf3b8c35ee1334d6f7e3774f0db076bde042601fb

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