Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7d755ceb5d9145…

MALICIOUS

PDF

38.0 KB Created: 2020-11-05 17:19:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1c9bfc77deab7c037f225a7f70cdf9eb SHA-1: 1c857ffa0a42db9306620943a808817340c2f02f SHA-256: 3c7d755ceb5d9145d7e9c0617679d39e4fd330e0e13b09f0922d656a546503a9
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 services, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document's primary purpose is to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://trafficel.ru/aws?keyword=fantasy+football+today+hq PDF link annotation
    • https://tukowozurowogof.weebly.com/uploads/1/3/4/4/134440104/wuviwujegisoma_bekexejukodis_nulizoxeb.pdfIn PDF document text
    • https://virukuzababije.weebly.com/uploads/1/3/4/3/134350100/kabulotujoden_gokobe_voraz.pdfIn PDF document text
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/00ec68.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/d0a254741.pdfIn PDF document text
    • https://sumijiluwovoj.weebly.com/uploads/1/3/4/2/134266387/9465849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5f920197abdc8.pdfIn PDF document text
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/592a9ee0c4e6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391015/normal_5f8f5fe199a73.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/farezelof/kijinabamutagozuduf.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/schedule_6_balance_sheet_format_download.pdfIn PDF document text
    • https://s3.amazonaws.com/radaruropivoje/drag_coefficient_of_a_coffee_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/90284137459.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/goddard_usd_265_map.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/calendario_mundial_2018_espaa.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_off000055c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55C8 5220 bytes
SHA-256: b4695bd190ef7d7789b292bf6f0319c112b6f0f491817d1458daf1ddfdf4181b
font_01_sfnt_off0000678a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x678A 10440 bytes
SHA-256: e86a7181c2ce2af487512babbd2c1e1f5752413fe56422a5b07340c1710591f7

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