Malicious PDF — malware analysis report

Static analysis result for SHA-256 5863d7f6844ca1f7…

MALICIOUS

PDF

80.2 KB Created: 2021-02-19 12:36:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f00f5edb83fb9010bb6d54b0d115d2a8 SHA-1: 51ce563801ee7297a7418c2e276fb07f222efecf SHA-256: 5863d7f6844ca1f72d5e3ad162ba7b9ce8f1c2d351a6c56ff770852c791e7f19
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and identified as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=define+population+distribution+in+statistics PDF link annotation
    • https://cdn.sqhk.co/kagumuzom/icDgc8N/7280098122.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495973/normal_5ffcd6c6323ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481667/normal_5fd0862489b6f.pdfIn PDF document text
    • http://lirerigoteses.22web.org/snt-_tc-_1a_2006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496225/normal_60240c496933f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_5fd3a9fb4eb18.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/l9gdBif/14928010161.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500453/normal_5fc68b20a25b0.pdfIn PDF document text
    • https://cdn.sqhk.co/powitaxixu/jgf9Zig/neko_gacha_cat_collector_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445754/normal_5fd7f7f845785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_602e836c86d5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lajirobodogew.epizy.com/foundation_css_html_templates.pdfIn PDF document text
    • http://moniladipawi.epizy.com/chemistry_chapter_2_test_answer_key.pdfIn PDF document text
    • http://loratozojakin.epizy.com/nadaguides_rvs_camping_trailers.pdfIn PDF document text
    • http://kukejisagev.epizy.com/barnett_shale_formation_map.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 5172 bytes
SHA-256: b0c261e9581e251651e94e468ca53c5f48844903df300aa9cde7a21b3c6f87cd
font_01_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 10600 bytes
SHA-256: 492ec984e6743133f7e8cd363decaabf36f95ca9e0777bf91e6a25c7ca4e6ac3
font_02_sfnt_off00012528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12528 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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