Malicious PDF — malware analysis report

Static analysis result for SHA-256 52df76c40a66bbd9…

MALICIOUS

PDF

67.5 KB Created: 2020-12-29 18:41:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8f1c5888a240c0cac97dc3e9485b503f SHA-1: ed2a1a5ed0b6e97ff43817ec4ff43108bc1c7ccd SHA-256: 52df76c40a66bbd96b419b7d65634f284498067f28c5435b015ba9a59f9ee906
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one heuristic specifically flagging it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://trafftec.ru/strik?utm_term=gothic+western+boots', which is likely used to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, but the presence of numerous external links suggests a phishing or content distribution vector.

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://trafftec.ru/strik?utm_term=gothic+western+boots PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419640/normal_5fd3d14965c00.pdfIn PDF document text
    • https://vugosolisaxude.weebly.com/uploads/1/3/2/8/132814967/zijagakinom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466175/normal_5fa4fc8d7f030.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/vuxalirudidel/animal_crossing_new_leaf_pc_emulator.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/5748389790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8b93b97-ac15-461a-884f-98838483ca79/double_bubble_tea_house_jobs.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/iceman_2019_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kizuporowefib/lejokusinifasobake.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/characterization_in_literature_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/111c56fa-a981-4de4-919a-05d25533b722/jorivonijamozerudelimejat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50808cc0-6655-4ec1-9b7d-e5b90583c31b/31614938434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cc85a1f-bbdb-46f8-8b3c-203ed264ce15/distance-time_graphs_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/biography_template_grade_3.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_off0000c745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC745 4908 bytes
SHA-256: c4a97c5bafbf7154feb55c7eb648f4fd31b744f6c5b0a6ec534bf21374914d3f
font_01_sfnt_off0000d80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 11892 bytes
SHA-256: f2ba7530772d7091fb0f22c13cdd1a128ac60a53dca18ec9ada6dd0d6c9ae20a

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