Malicious PDF — malware analysis report

Static analysis result for SHA-256 5536d6d49211d3ae…

MALICIOUS

PDF

79.9 KB Created: 2021-03-10 05:58:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d8c9db47da5f64af9bd479050782d985 SHA-1: 57f5fde5ae2b42640fba5488561f325d2446674f SHA-256: 5536d6d49211d3ae50d1b5d7c9f40c00f9bbba077b53a2e105359b2ccd1a7e9f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are to benign-looking PDF files, but one prominent URL leads to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded content, though heavily obfuscated, suggests the document is designed to redirect users to potentially harmful sites.

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://mezovuduw.ru/strik?utm_term=what+is+another+word+for+held+captive PDF link annotation
    • https://kulebizafiwuna.weebly.com/uploads/1/3/4/4/134434336/gawuromi.pdfIn PDF document text
    • https://bewebisiseten.weebly.com/uploads/1/3/0/8/130874130/1532773.pdfIn PDF document text
    • https://nelibijejukeli.weebly.com/uploads/1/3/1/4/131437261/ec4f134aeab326.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/jonixofosotivo.pdfIn PDF document text
    • http://kiparegazeratax.getenjoyment.net/9794143398.pdfIn PDF document text
    • http://rovolimobu.iblogger.org/what_is_experience_economy_definition.pdfIn PDF document text
    • https://gekafokolasiga.weebly.com/uploads/1/3/1/3/131384301/9107781.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/zabejuvijolu/35748256915.pdfIn PDF document text
    • http://wefazor.epizy.com/maths_bodmas_worksheets_for_grade_5.pdfIn PDF document text
    • http://zorikeroz.onlinewebshop.net/gunuwulatarul.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/xerulukigesulubexisux.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/zagat_guide_2020.pdfIn PDF document text
    • http://kekokid.epizy.com/bacterial_toxins_review.pdfIn PDF document text
    • http://topukonas.rf.gd/pedaleira_zoom_505_ii.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/what_is_knowledge_management_software.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/cat_s_cradle_julia_golding.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/bangalore_weather_report_tomorrow.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/bartender_ultralite_free.pdfIn PDF document text
    • http://sulijugofogim.onlinewebshop.net/bipokukuba.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_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 5408 bytes
SHA-256: 1f5f7968f0d5992ae1e0fec73f91e1589504f0f42fe3d3a2033ca9192d3f3b49
font_01_sfnt_off00010e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E33 10572 bytes
SHA-256: 814a77c94f0ff878d688b5cbc0e3585451f444d6c2eeac3f15246a47e18bd967

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