Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf1351b6a39a6d0…

MALICIOUS

PDF

57.5 KB Created: 2020-11-12 12:45:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 806b5f8f9e698c8026da5ea123c7e2c4 SHA-1: 1fcd01a0cc8830599c09a41c47e86ba6ad3360d6 SHA-256: fdf1351b6a39a6d05014c900c80174703424fefe906ae47209fe6b31894c6a29
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to external PDFs hosted on disposable domains or known malicious redirectors. This indicates a deliberate attempt to create a link farm, likely to distribute phishing content or further malware payloads. The ClamAV detection and ML classifier strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=ho%2527+oponopono+libro In PDF document text
    • https://lifusapemar.weebly.com/uploads/1/3/4/5/134526201/5a86abcb8e66ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_5fa6e62ec1a7d.pdfIn PDF document text
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/8545560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464995/normal_5fa9620ca706a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_5f8af04ebcd38.pdfIn PDF document text
    • https://madovokego.weebly.com/uploads/1/3/1/4/131409717/zelugiluwif.pdfIn PDF document text
    • https://jorimedazaget.weebly.com/uploads/1/3/0/7/130738946/6410751.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/bewoti.pdfIn PDF document text
    • https://dewufixibofapez.weebly.com/uploads/1/3/4/5/134596153/belekupiw.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/zunaduxa/deeded_lots_in_rv_resorts_fl.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/malokabativepogibas.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5E8 4560 bytes
SHA-256: 7fb8f66e6b29c8017a1ac59b8a6e9af60cd0a1753e390327ffd8a7f891e32557
font_01_sfnt_off0000b571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB571 10460 bytes
SHA-256: bc5878df1a74111b744ee5221187dc4734b9c52d76486ce0d9bdad262976859f

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