Malicious PDF — malware analysis report

Static analysis result for SHA-256 735a0be64ff1d737…

MALICIOUS

PDF

64.1 KB Created: 2020-12-14 20:20:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f1712ee5a18225cdb32dc6e696d16b22 SHA-1: 25e4627b840fcd77bf7c6b15461536bca439540e SHA-256: 735a0be64ff1d737dfd43e1109c7cc5cb7e3f9b2aa8b807ed215d0a0dc5b1784
156 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, identified as a 'PDF SEO Link Farm', suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points towards a redirection or download mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://trafftec.ru/strik?utm_term=demised+premises+synonym PDF link annotation
    • https://tiralilibixadu.weebly.com/uploads/1/3/4/5/134500138/1ff4f.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/zanazanekoxel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_5fb8f3d67c391.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/9250607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496146/normal_5fac4c3e2e590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379605/normal_5fbc269249ab7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449205/normal_5fbf4dd9601f9.pdfIn PDF document text
    • https://xexonukomamub.weebly.com/uploads/1/3/4/3/134353621/laridelor-bivesagi-tokaxarofemu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc7116deddbb05c68931a73/t/5fc95028c245392aa2d1cf4e/1607028776078/82013354864.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2b0d2239b0722913ccfbe/t/5fd204731693665fc7d6e818/1607599219341/rigeb.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_off0000be17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE17 4964 bytes
SHA-256: d355547577f8f4ea161fe3169f1aa14700d18da7cc16c20de27815da42486edd
font_01_sfnt_off0000ceee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEE 10920 bytes
SHA-256: 8bbd7e98d63af20c675eefdf4cae5103677a9e28051cb0e50f489de24fb193bd

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