Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bdfd82315c10d1…

MALICIOUS

PDF

73.6 KB Created: 2021-06-04 12:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b9488c7aeeb3ce84c8c9645d04da41fe SHA-1: 09de64ab777fe9ce7a1593b059678031140a2cc7 SHA-256: b4bdfd82315c10d115d16257bf7388a6b570e1a04a1cd3b95099bf4751901529
96 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://cructi.ru/pbw?utm_term=oraciones+con+sujeto+predicado+verbo+y+sustantivo', which is a strong indicator of a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URI and the malware verdict strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/pbw?utm_term=oraciones+con+sujeto+predicado+verbo+y+sustantivo PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413000/normal_6008453488f08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_601bc7109d079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378830/normal_600c5f5ab7ebc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379053/normal_5fcce414daa7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403688/normal_6036b65a52bd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489852/normal_603b3bf59ee63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419846/normal_602e4a8aa0696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_600ca0a114686.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417414/normal_5ffc9a9f854ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451757/normal_6051c96921263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_605d7dc7d03f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4e55b84-709a-451b-8997-83500b0d3f15/best_jump_starter_with_air_compressor_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0b0315c-b3a2-4d29-b58c-2aa0e266cc02/23816795670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/366618f1-24f8-461d-81f1-fd368a8894b2/wamibubeda.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/sebeloseputiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb31b552-6fb2-42ea-a89f-083deb42ff5f/60146105880.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b93c58b-fb69-4f26-ac57-7ac009f17051/85272999214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec06853-38fe-4bc7-903b-4c9566ab0b84/mebopega.pdfIn PDF document text
    • http://fipivuzigoge.pbworks.com/w/file/fetch/144424524/cuales_son_los_tipos_de_sistemas_operativos_mas_comunes.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_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 5440 bytes
SHA-256: a323c27bd7faa63321e0efa595e7bee621eccaaf7ae3349f154a5c6b86c01b22
font_01_sfnt_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 11448 bytes
SHA-256: d4030ccc54cb437d3df6070d63505d05d569bce80aaff59fa32bf4abdedb6780

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