Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf736c81c4ade76…

MALICIOUS

PDF

67.4 KB Created: 2020-12-09 04:43:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e4e0c72b4be681197ea269593aadb330 SHA-1: 04e3c2b5918b6ecaead0de457a690d1e786056f6 SHA-256: fcf736c81c4ade76a2bac16e80ec15217f9e92f564a45bbaaba618739568c546
214 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised as a 'Pacific fitness catalina home gym manual'. This heuristic, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9883

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=pacific+fitness+catalina+home+gym+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386848/normal_5fb02bd262c00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476432/normal_5fc0d81f5f6a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_5fb345cfe0a04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457332/normal_5faff50c0e874.pdfIn PDF document text
    • https://tilafiranude.weebly.com/uploads/1/3/4/3/134314128/5424728.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472760/normal_5fbefef23a929.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/fogibi/college_essay_rubric_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/44984272827.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_off0000c983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC983 5300 bytes
SHA-256: b4b1c0bf92bb51d3e50de49acd8fe5b392250ee238744872b62c0de27dba45ce
font_01_sfnt_off0000db74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 11448 bytes
SHA-256: 987bb9d831415b967ac5ba4cf8ba5fec71ad6001d102a9a6c7ea1a4993fcf8d3