Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ab3c8e30599806…

MALICIOUS

PDF

65.9 KB Created: 2020-11-13 02:54:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: dcd1097c37e921c9c0a82af7d030ce22 SHA-1: bb3813f2b75937141074ec77511cd69333d71940 SHA-256: 37ab3c8e30599806865dbd884d61e8e692cbcd00641803e2304e99e0d9f900c3
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, many of which point to suspicious domains and are likely part of a link farm designed to distribute malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest it's designed to redirect users to malicious content, potentially leveraging embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=newton%2527s+three+laws+of+motion+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5fa6233915fb6.pdfIn PDF document text
    • https://sugosagugijew.weebly.com/uploads/1/3/4/5/134584769/f9cb973.pdfIn PDF document text
    • https://gixejeti.weebly.com/uploads/1/3/4/3/134326891/403358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_5fa2cfe6138a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423460/normal_5fa4519914963.pdfIn PDF document text
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/4902000.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/151542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412767/normal_5fa7da1af271e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_5f8ea6bc0dccf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412905/normal_5f952260d8d3b.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/betimugi/teguboxivutenezotuguvoj.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_off0000c506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC506 5168 bytes
SHA-256: 8ed06193ec1c883de9d79fdb80bf796f113854223557efbc05a1a78e2a98fe82
font_01_sfnt_off0000d689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD689 10472 bytes
SHA-256: 330475f1fea99bf5854307c4d803878025aa52a3f47c1479950ac709526b9d39

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