Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d9241d3cae14c2…

MALICIOUS

PDF

123.7 KB Created: 2021-02-18 06:08:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2c6bfd1a7afcc74652242bab4426b16d SHA-1: 9f42b12fb999dcfca6eedc66e696596054357502 SHA-256: 25d9241d3cae14c2058a379cd44257df8a4dbc073889a57dbfa8c03ae337320d
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and heuristics confirm the presence of links to known malicious infrastructure and a link farm on disposable hosting. While no scripts were extracted, the document's structure and embedded links suggest it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=is+wawa+gas+ethanol+free In PDF document text
    • http://xuxisozolawub.22web.org/chashme_baddoor_full_movie_hd_1080p.pdfIn PDF document text
    • https://cdn.sqhk.co/fudixaxogub/yjdhfia/bitlife_life_simulator_online.pdfIn PDF document text
    • http://twitter-center.com/951030444388rqnr.pdfIn PDF document text
    • http://depafelevan.22web.org/53522363595.pdfIn PDF document text
    • http://apparently-home.com/abstract_nouns_worksheet_for_grade_5bgoyj.pdfIn PDF document text
    • http://zujonatuvetivux.iblogger.org/ipad_air_2_cellular_ipsw.pdfIn PDF document text
    • http://picsonair.com/kinoni_barcode_reader_pro_apkcyspf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465556/normal_5fdb7ccd8a29c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5fe79fead957d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477373/normal_5fe3a34a3fa69.pdfIn PDF document text
    • http://ritual-venki.online/60547143498f17m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://novegiw.rf.gd/3_times_table_multiplication_worksheets.pdfIn PDF document text
    • http://pikusotanuw.rf.gd/adobe_update_signature.pdfIn PDF document text
    • http://zizinamejukurep.rf.gd/cashback_for_communities_application_form.pdfIn PDF document text
    • http://nowivopikuzud.epizy.com/berifiwagisi.pdfIn PDF document text
    • http://ribuxuvotamu.rf.gd/google_chrome_74._0.pdfIn PDF document text
    • http://notijopozij.epizy.com/avolites_personality_library.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_off00019a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A2B 3000 bytes
SHA-256: 160557b46af3dcde5498cfb8a5c5c2f9e6074fdfeca44a4132b0bbfb23d54d73
font_01_sfnt_off0001a4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4EB 5060 bytes
SHA-256: 7b15694aa8b3f965d4d0459a9151c89279abda27622b72c7531ebb6fbb6a32c7
font_02_sfnt_off0001b632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B632 12304 bytes
SHA-256: 7cd4a7a9e62a97f19f7258bae3d410aba28faa1b67b43cc4b21098eee2b13ef7

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