Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d25435222d4c6cc…

MALICIOUS

PDF

72.8 KB Created: 2021-02-21 05:07:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3d25a250fa70bab8180739ffdde19c77 SHA-1: 70bfb7eb5ee8a86faa440268b5385bc1becbf031 SHA-256: 3d25435222d4c6cce459adacad030855b01d3b1b9041859fa6574b13016f4857
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation or redirection tactics.

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://druttle.ru/strik?utm_term=karns+church+of+christ+sermon+outlines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487382/normal_60249103a9ebc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461767/normal_5fe10e93d9747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_6022df560a249.pdfIn PDF document text
    • https://cdn.sqhk.co/koporikog/Ahfgjje/12952897067.pdfIn PDF document text
    • https://melajepanaxon.weebly.com/uploads/1/3/5/3/135398769/sisububijuxixazebo.pdfIn PDF document text
    • http://opssmall.space/48096995481acjac.pdfIn PDF document text
    • http://manekobe.22web.org/samsung_a10e_specs_canada.pdfIn PDF document text
    • http://hot-money.fun/gemuzikuwinobaradogfqdqc.pdfIn PDF document text
    • http://idealslimitalia-official.site/apsc_syllabus_2018incry.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/9476404.pdfIn PDF document text
    • http://verifybadgesbusiness.com/tesda_bookkeeping_reviewerbmn0d.pdfIn PDF document text
    • https://xolivura.weebly.com/uploads/1/3/5/9/135958321/1d0741dd4c56957.pdfIn PDF document text
    • http://sadovik.me/wogulepoxenezatekibekama7ztu9.pdfIn PDF document text
    • https://xaxuxogupovugid.weebly.com/uploads/1/3/0/8/130874119/c1872efd094e18c.pdfIn PDF document text
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/mawofi-nezewanelu-finidag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bonitadobizaw.epizy.com/9748970900.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_off0000e084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 5092 bytes
SHA-256: 2b55de5101d5d3a6308fed0f36bc12fd1ee8d481ccf259dbd7d490f2326b75f9
font_01_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 10612 bytes
SHA-256: 4d0ff97565511a5db5342407e197b05f3a7a54abe7367235b297e4a4fcfa19d9

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