Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ebdb88114e8c14e…

MALICIOUS

PDF

76.6 KB Created: 2021-02-23 15:54:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 307bb09cdff0cb29daf43a99af491c1c SHA-1: 10d71ed1ce502fe82acbcd079699e9b7d3f42b5f SHA-256: 0ebdb88114e8c14e5e687092e93e3ea478f3a3cb301bf21800b3caec838cbeb3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('baarspo.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, further supporting a malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/strik?utm_term=toshiba+ct-90302+channel+scan PDF link annotation
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/821226.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474205/normal_5fded568e5e3f.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/e61033443.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381973/normal_5ff7fcbcea126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464530/normal_601fef22d142f.pdfIn PDF document text
    • https://xapefawisago.weebly.com/uploads/1/3/4/7/134771693/6988233.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393925/normal_6002e74785200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485799/normal_601650c229eb9.pdfIn PDF document text
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/6407637.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dabesajunelazul.rf.gd/ny_stock_market_today.pdfIn PDF document text
    • http://kagubosewox.epizy.com/lesson_4_forms_of_government_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/najun.pdfIn PDF document text
    • http://fazemiwasagi.epizy.com/xidawudanezibuxomidedawi.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/texew.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_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 5504 bytes
SHA-256: 04d96c5ac21f804055c5d978c8bb4aad2d54be40b3a6b02799de3cc4c0bb0bde
font_01_sfnt_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 14144 bytes
SHA-256: 769e33c249723c42d04e097f3bd71ab02beb469f7065bf4510e5dfd3c095470f

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