Malicious PDF — malware analysis report

Static analysis result for SHA-256 10520ea4e1695457…

MALICIOUS

PDF

66.1 KB Created: 2020-11-25 19:25:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3dec27aeb82f4dfbeaa8b00da235944b SHA-1: 9d459a60d1436d675398e0cfd005b7fffc37b75d SHA-256: 10520ea4e1695457dca6e92a24510fe2dd7666d537930e93903f2b66dbab4e8f
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 numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or create a link farm. The presence of a malicious ML classification and ClamAV detection further supports its malicious nature. While no scripts were directly extracted, the PDF structure and embedded links point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?utm_term=ar+answers+for+harry+potter+books PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5faf9dceedd6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_5f9b7ab4815c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469623/normal_5fb9d3589ab6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5fa43df2caab0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421058/normal_5f9f8acdb7d2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368244/normal_5f979ab39a08d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_5f89f33ba97df.pdfIn PDF document text
    • https://dodimugu.weebly.com/uploads/1/3/4/4/134483739/xujabajujirusebiju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469355/normal_5fafeb27f3298.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/mazugezijap/91802969449.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_off0000c6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DE 5344 bytes
SHA-256: bdce14705c9df5e24862fdc39e096ec9d95c3c42f62e119383f5731e8d645805
font_01_sfnt_off0000d91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91A 10316 bytes
SHA-256: b2c4a43f7cab51a92f0a190b571fd640b06810505580d5e3aab77cd4eb180987

Open this report in the interactive analyzer, or submit your own file for analysis.