Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55265fb5204369e…

MALICIOUS

PDF

96.3 KB Created: 2020-12-08 03:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 78f49db500c999f56016c699c7fb1c6a SHA-1: 184640b0a2e05d3056527dff975e89e3e5bd0ed4 SHA-256: d55265fb5204369e03b86967447f8de4f67eae7aa3673749661b5b757a72f9e9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF SEO link farm, with one prominent URL pointing to a suspicious domain. ClamAV detection and ML classification strongly indicate malicious intent, specifically a phishing or trojan distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=purple+bunny+games PDF link annotation
    • https://wevokowuluza.weebly.com/uploads/1/3/4/7/134739861/juponafizelezul.pdfIn PDF document text
    • https://pezujotage.weebly.com/uploads/1/3/4/3/134318684/takox-bibomaxuzokel-zorulinefob-wirijeguz.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/vovabagubajegeb/nopoxere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734197c1-5e57-4c41-a161-7c824abbd516/74162148140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a72f2dd9-59a7-4c3c-bff8-339d6054fd4f/22937086823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/461ebe6f-aa35-45c0-9970-807aed7bbd56/58239662053.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc52e9b17e720264005f89a/t/5fce044724c49707d344a719/1607337032031/15899229358.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ea21c30a162e0c52977d/t/5fc9f3ec8d0ac92c7be6ab12/1607070702919/16794459128.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0bcfb2e537a05ef083615/t/5fc9c0528d0ac92c7be2081f/1607057490498/15856984632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f32b1318-3f6b-4191-bea6-7ae80da2d7a2/jean_marc_robin_perdir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4437f90-bf0a-4c41-99a7-9129b1eef07a/19730102363.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc52473a3bf4b14abc498e4/t/5fc618073c02f22b9ddd202c/1606817799947/d-_kefs_color_word_test.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA6 3004 bytes
SHA-256: 76f01e912820fa9ccbf35f6022c6d2d97e2db958ef5f1b68ef0be0191734a295
font_01_sfnt_off00013a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A56 5380 bytes
SHA-256: 5bb5d9ccf0c60285bbe8958e177c263f5e4f36a949d155b558fb46264a1f302c
font_02_sfnt_off00014c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C93 12528 bytes
SHA-256: 8a0188b4a0d3c38001798bad6c18f6dd9ac6a1c616bc5bac6933e7f87fd1d7d8

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