Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc3a4d78f537b6a…

MALICIOUS

PDF

86.2 KB Created: 2021-01-08 06:11:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: afb933f72afa6a0eea66ffd0924d4b40 SHA-1: 00c33df6013aa63214957fc82e5a7e40e507919f SHA-256: 0bc3a4d78f537b6a403dc8cfa865ff7a56dfda29c178e9dc2ef6a83d0ff1325e
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to distribute malicious content. The heuristic firings, particularly PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM, strongly suggest a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the link farm and the ML classification point towards a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://cctraff.ru/123?utm_term=book+of+genesis+study+guide In PDF document text
    • https://cdn.sqhk.co/jevikepuja/fBiihfB/67565643674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386074/normal_5fe88f134ec7b.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/5483637.pdfIn PDF document text
    • https://zubusaxomik.weebly.com/uploads/1/3/4/8/134883199/binuvaligo-gukamezita.pdfIn PDF document text
    • https://dunexagog.weebly.com/uploads/1/3/5/3/135303431/8291478.pdfIn PDF document text
    • https://zukikopan.weebly.com/uploads/1/3/0/7/130775822/b56d79c700040.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419626/normal_5fcf741a09a44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378830/normal_5f8a7405ab052.pdfIn PDF document text
    • https://jomitapekox.weebly.com/uploads/1/3/4/3/134319499/51871ba2dcac585.pdfIn PDF document text
    • https://fupelesanu.weebly.com/uploads/1/3/1/6/131606305/fizuresax_berakazatutiv_lemoxixome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495043/normal_5fd218609484b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409411/normal_5f95cadf69499.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001180f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180F 4952 bytes
SHA-256: f6f81c276fd2e86136e066a306972e69177f84b727790778910f0044cda9e02d
font_01_sfnt_off0001291c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291C 10168 bytes
SHA-256: bebb070749522a0847fb3416e87c2824c9df1dea07290a1149f57b6d9816414a

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