Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d2aa53bfde7bea…

MALICIOUS

PDF

60.8 KB Created: 2020-11-20 15:22:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3a551f809d8a7edfd151357578fccdac SHA-1: 068e2f967221b06ece1e7cccf09c85ee89517e9b SHA-256: 20d2aa53bfde7bea0f845ffd24b713b75a764f32edd5297ecd12f11dca5eeb17
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, forming a link farm, and is flagged by ML classifiers and ClamAV as malicious. The embedded URLs, such as 'https://trafffe.ru/strik?utm_term=grant%2527s+dissector+15th+edition', suggest a phishing or malware distribution attempt. The document's structure and heuristic firings indicate it's designed to redirect users to potentially harmful content.

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://trafffe.ru/strik?utm_term=grant%2527s+dissector+15th+edition PDF link annotation
    • https://nifufoji.weebly.com/uploads/1/3/4/4/134458522/kodigevugikixopox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5fb33cd3cc04b.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/5615478.pdfIn PDF document text
    • https://jijoromosuw.weebly.com/uploads/1/3/4/7/134714512/wejide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494673/normal_5fad8adc172f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f88d7de2366c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382619/normal_5f9256fd4d356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407818/normal_5fb28cc0e24a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393754/normal_5f965955dbb87.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/xokebore/1690525745.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/fazikuzepewuwigos.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/mofitofesuxilevolopujage.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_off0000aebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBC 5236 bytes
SHA-256: 2ea6e9cafa6dc08b2df3596eb5d78a6517c5ffd284f723a2376a41fe87fe5666
font_01_sfnt_off0000c090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC090 11136 bytes
SHA-256: 0e5a3c649cc48328e12b9eca2a0afe7dff45de28107f1b1c5c1d4d6a4af02e38