Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe1154a272d09f0…

MALICIOUS

PDF

69.1 KB Created: 2021-02-15 16:00:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7e296f3de5a3ef8ca8b69ded808369c3 SHA-1: 28c48385406216044b22a47df16ee3bd28c4259b SHA-256: 8fe1154a272d09f0d7f2c52707b3acf3f8b6f497b495a29df96bef69273cc82e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://seumenha.ru/strik?utm_term=vicks+vaporizer+and+copd PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4448547/normal_60064dd664516.pdfIn PDF document text
    • https://mubelumovetofap.weebly.com/uploads/1/3/1/8/131856402/024a9bc365f0a.pdfIn PDF document text
    • https://xunopigiwigon.weebly.com/uploads/1/3/1/6/131636761/9957326.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/1773121.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/jerivisisoponosaz.pdfIn PDF document text
    • https://sunivisoxeban.weebly.com/uploads/1/3/4/4/134493344/dotur.pdfIn PDF document text
    • https://xigukiburid.weebly.com/uploads/1/3/2/7/132741693/biperagoze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528260/normal_5fecbbb6e6a48.pdfIn PDF document text
    • https://xixezowipena.weebly.com/uploads/1/3/5/3/135341666/6b3932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489593/normal_601e4014edc06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484812/normal_5fc87a16a1122.pdfIn PDF document text
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/6675125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391893/normal_602144c20b84a.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/minabiwa/63911157705.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/microsoft_access_2010_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/59811842777.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_off0000d2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E7 5172 bytes
SHA-256: 28208ca03fe3e076b712af8096005119a3187b7cd7f11068d0d3061aa7688e17
font_01_sfnt_off0000e4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 10164 bytes
SHA-256: f0dd9c40c354f4c24c5aafcb4a0fc08bb7c3a8311f627bbbf38d7cd423f52f3d

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