Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f90eaea0f3d69a…

MALICIOUS

PDF

72.9 KB Created: 2021-06-02 09:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e45db6d29aed78268bfbe9775aaab49c SHA-1: db984e7a9d63d3ec5225a77b2097be3dafa6cd6b SHA-256: 43f90eaea0f3d69a69daae5ecb7b74824b31dbffb35efa0b2d80bb25ba020f7c
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malware or conduct phishing. No scripts were extracted, but the high number of external links suggests the primary attack vector is directing users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://catamma.ru/pbw?utm_term=how+to+install+onn+full+motion+tv+wall+mount+13-32 PDF link annotation
    • https://kiparefewegapip.weebly.com/uploads/1/3/2/6/132682538/642d19c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408180/normal_5fd04b05cd030.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445130/normal_5fe3e44036061.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379733/normal_5fe0d74a1e524.pdfIn PDF document text
    • https://sobasoje.weebly.com/uploads/1/3/2/6/132695832/mavumetuvojifum_lizudikudisiwam_mezujogutuxiwat_fozar.pdfIn PDF document text
    • https://tuvukorop.weebly.com/uploads/1/3/1/8/131857527/lokeveg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467589/normal_6061b74b71696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451018/normal_60357e96a523f.pdfIn PDF document text
    • https://kitipodowenin.weebly.com/uploads/1/3/5/3/135383326/2571933.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wejojixi.pbworks.com/f/vamalatitizepasuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b15be026-b78c-4b97-a353-2f16c53c8157/77049715703.pdfIn PDF document text
    • http://gabumur.pbworks.com/f/xosukorezofeketak.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144427704/building_maintenance_service_agreement_template.pdfIn PDF document text
    • http://zigunef.pbworks.com/w/file/fetch/144479139/70942293581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1831a7bd-382c-4f2e-a136-11184e928b8c/ralph_waldo_emerson_nature_essay.pdfIn PDF document text
    • http://masawumel.pbworks.com/w/file/fetch/144427965/hay_day_mod_apk_latest_version_1_41_174.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/true_skate_all_maps_apk_2018.pdfIn PDF document text
    • http://tagexoba.pbworks.com/f/devipefe.pdfIn PDF document text
    • http://pefagisunel.pbworks.com/f/lego_halo_pelican_dropship_instructions.pdfIn PDF document text
    • http://rorazokazog.pbworks.com/f/sudebafulakumurirelus.pdfIn PDF document text
    • http://jizakatum.pbworks.com/w/file/fetch/144489486/vakejijorejuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66c34ee6-9ed9-4345-b229-d3903063cf15/samsung_gt-p3113_tablet_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef9a7ae6-cd8d-4750-8bbd-f667d47821ef/75621143601.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_off0000dfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE2 5308 bytes
SHA-256: f4d3709ecd280ac7d7b3868d02fb522e6747830a60cd6113f684c4873856657b
font_01_sfnt_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 10504 bytes
SHA-256: 19b59238943543cc26300b9720338c0fcbe602dc9797e846e8df3ee7d24bc907

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