Malicious PDF — malware analysis report

Static analysis result for SHA-256 435dd5fd6dafec9a…

MALICIOUS

PDF

76.6 KB Created: 2021-02-26 09:39:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 916489743714d60c47be52b1051fe79b SHA-1: 94ce505f2bf325e439c54e69671264a2e1184393 SHA-256: 435dd5fd6dafec9aa720305625192c6e0a037c5abc1bc160f123687a064575de
96 Risk Score

Malware Insights

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

The file is identified as malicious by a ClamAV detection and an ML classifier. It contains an embedded URI pointing to a suspicious domain, 'jottigo.ru', which is likely used to host a phishing page or a second-stage payload. The PDF structure itself does not contain readable text, but the presence of the external URI strongly suggests a malicious intent, likely related to phishing or malware delivery.

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://jottigo.ru/strik?utm_term=management+information+systems+%2528mis%2529+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368504/normal_600e5c865eb93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492546/normal_5fe45ecf4a5c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457838/normal_6008331c6759a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388626/normal_5fe0d0576b5b7.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/vizadesoj.pdfIn PDF document text
    • http://igcopyrightverify.com/homelite_electric_weed_eater_head_removal7f5p6.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/nissan_sentra_2015_service_manual.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/sorogamat/write_bibliography_for_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/history_timeline_template_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/xovarexut.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/zovisitawopusozuzijiki.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/teri_akhiyon_ka_kajal_mp4_video.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/c_openxml_create_word_document_from_template.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/komik.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/sentence_correction_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/gulam.pdfIn PDF document text
    • http://kopolug.myartsonline.com/16053247874.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_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 5552 bytes
SHA-256: fc7995be2a6d36f99fae46c2231793cf34ba4edeb0ad42a261119b695ea5524d
font_01_sfnt_off000102fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FA 10028 bytes
SHA-256: a6f11ee52766f7480bf5278196bbd544c8abab95324719634ba8e621a7385593

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