Malicious PDF — malware analysis report

Static analysis result for SHA-256 4815f4cb2123cfe4…

MALICIOUS

PDF

77.0 KB Created: 2021-04-08 01:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e6c053243993e2c0fc6bff8f0a77bd52 SHA-1: dfa87a53f16267c6555f64b03921db29d4390221 SHA-256: 4815f4cb2123cfe434e28a67b55524e41c2ed0ba12318d79954d0bd25b8baa96
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external URIs, many of which point to disposable hosting and are likely part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, potentially for phishing or to download further payloads.

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://pelibifir.ru/wix?keyword=house+of+faun+floor+plan PDF link annotation
    • http://steblin.pro/lulebesitisaruroroki2r4en.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5fd89e51a54c2.pdfIn PDF document text
    • http://goloszauniver.fun/syro_malabar_liturgical_calendar_2019_malayalam5b8ts.pdfIn PDF document text
    • http://load-bcp.com/20312534863fi2pe.pdfIn PDF document text
    • http://deutschebank-meine.com/899158581429ytz7.pdfIn PDF document text
    • http://insuranceautousa.com/what_is_a_window_kit_for_a_portable_air_conditioner8yoox.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://mirror-x.org/314067183275cmx2.pdfIn PDF document text
    • http://milanomodaitaly.site/albemarle_county_va_police_reportsh0qft.pdfIn PDF document text
    • http://pestore.pro/timex_ironman_triathlon_reset_batteryyupne.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_5fd307c88168b.pdfIn PDF document text
    • http://x-bionic.shop/are_there_termites_in_virginiatiiyw.pdfIn PDF document text
    • http://korsabarca.com/jofawumetawopno95t.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/lomuper/common_projects_sizing_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/brother_mfc_8950dw_driver_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/peg_perego_primo_viaggio_4_35_forward_facing_installation.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_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 4856 bytes
SHA-256: 320b78ccd4796bf8833568719d7a5e6f9dae151021f9eb8f675c713bd5c01e91
font_01_sfnt_off000102cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CC 10720 bytes
SHA-256: 3bfc77f83be8f7e77364ab5fbd5acb42269baf5e6aa5ae3b208a67bf6fd157e3

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