Malicious PDF — malware analysis report

Static analysis result for SHA-256 4034fe6dcd4446b1…

MALICIOUS

PDF

75.2 KB Created: 2021-02-25 16:03:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: c00deec212823ae3a97ebbb57a1a0358 SHA-1: 00694081940cb5ed609eab65b0d8f7295bbdf55c SHA-256: 4034fe6dcd4446b19e1e14e4b3ce63cdf18d009879bc129aa635d4c4a4fbbfb7
156 Risk Score

Malware Insights

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

The PDF file contains a link farm and an embedded URI pointing to 'jottigo.ru', suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lead users to external, potentially harmful, content.

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://jottigo.ru/wix?keyword=best+tv+theme+ringtones PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417423/normal_60253580d7571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461498/normal_6011f2716a14f.pdfIn PDF document text
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/948285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390381/normal_601e2b7d2fddd.pdfIn PDF document text
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/komokadoga_vekefiraroze_nosero_xadife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417025/normal_5fea26a19dae6.pdfIn PDF document text
    • https://xikisujegowo.weebly.com/uploads/1/3/1/8/131856166/xegarezas_zabokuxoj_wakejejaxadu_tenurebamezem.pdfIn PDF document text
    • http://litazil.22web.org/23398688652.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/vibasujefir/nogazoni.pdfIn PDF document text
    • http://buwumipulufi.epizy.com/dazatakasamowukudopudulix.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/66785107147.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/24872492011.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/free_2d_platformer_tilesets.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/66432867484.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/charlie_parker_alto_sax_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/ssc_exam_quantitative_aptitude.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/36296833136.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/roxelajas.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/walgreens_digital_blood_pressure_monitor_model_83_manual.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_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 4968 bytes
SHA-256: d36cbf088c6bde7767f72aaf3a51a6520695ee379f0be947714634b1335a58d5
font_01_sfnt_off0000fbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 10396 bytes
SHA-256: 14ca512653d1b2c8dfcd1a19169eae0d6eea763c82ece61b13c3ad4d1f6cf242

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