Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a4a308a5da430d…

MALICIOUS

PDF

76.1 KB Created: 2020-12-27 05:42:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e3a3a43e5cfafd78b9f5878072994dcd SHA-1: d4cb73b525a75f4a550bb806c20c6677fd977d8d SHA-256: 11a4a308a5da430da40f6848b1c747697cd4c66d904b09257e732877630d8e33
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The primary URL, 'https://trafffi.ru/strik?utm_term=online+piano+keys+with+sound', is likely used to redirect users to malicious content or phishing pages. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=online+piano+keys+with+sound PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5f8e9b5197b6c.pdfIn PDF document text
    • https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/bagaxisuked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365646/normal_5fe42e966a23b.pdfIn PDF document text
    • https://bemijojedir.weebly.com/uploads/1/3/4/4/134479802/46c42489ba2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_5f9ead930bad6.pdfIn PDF document text
    • https://cdn.sqhk.co/luvuxokam/if1jzje/besogodinawin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_5fdc6383a65f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476783/normal_5fb4e13ce21de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380072/normal_5fded5d02a5a6.pdfIn PDF document text
    • https://zilexewutefak.weebly.com/uploads/1/3/4/6/134608169/sutemefivufigatel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462341/normal_5fceb02bdf996.pdfIn PDF document text
    • https://naxomusiji.weebly.com/uploads/1/3/1/6/131606859/245684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411926/normal_5fd3267eeed44.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ec2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 5236 bytes
SHA-256: a8d5828a6f5a7881267dfb4208a7d43c3ae8838e1bb7b700c047b1e5c9b3cf23
font_01_sfnt_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 10768 bytes
SHA-256: 3e916745e236dabe217f628a4bc2330b95502c8d6e7943a2f0d5a194056cc84d

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