Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eed6515f21e6863…

MALICIOUS

PDF

66.7 KB Created: 2020-11-24 10:21:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d5049636ca8bd2a8a2cec017ca5c00d2 SHA-1: 20406f6c172eb7c11ae2c2e7d0b7de13d12cd44f SHA-256: 8eed6515f21e6863e0a2bfcd57c008fc5978e0037c2c8aa40313c34fb1554ee6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it could be used to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://traffking.ru/strik?utm_term=cantos+para+acostar+al+nino+dios PDF link annotation
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/vujevebok.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/7349712.pdfIn PDF document text
    • https://lolapozunit.weebly.com/uploads/1/3/4/5/134592397/1716771.pdfIn PDF document text
    • https://vadazexo.weebly.com/uploads/1/3/4/6/134646317/7828981.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/8807852.pdfIn PDF document text
    • https://masejufubalabej.weebly.com/uploads/1/3/4/3/134388341/gigulagidu-betab.pdfIn PDF document text
    • https://gurigibafex.weebly.com/uploads/1/3/0/7/130739571/dbb6ae8863eb5.pdfIn PDF document text
    • https://japiloxekafu.weebly.com/uploads/1/3/4/4/134480389/2624491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453732/normal_5fb4d0c626913.pdfIn PDF document text
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/4994630.pdfIn PDF document text
    • https://gapigapale.weebly.com/uploads/1/3/4/8/134896702/temolamukil_tuzagiwame_lazapazifune.pdfIn PDF document text
    • https://mujonesaxofifi.weebly.com/uploads/1/3/4/6/134680030/5411983.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/mesixadelomomo/environmental_science_study_guide_key.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/fujawegukejukun.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_off0000c874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC874 4972 bytes
SHA-256: 60072138a9e67db409771871860628b495b3a75fd71e017c9caabe0d0dd936f2
font_01_sfnt_off0000d95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 10764 bytes
SHA-256: 207c63e20f48c3dacec2b2aebcb8def43f7e47b0ec85774813b7b37e6e8b91c6

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