Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7bb72855e005d0…

MALICIOUS

PDF

92.5 KB Created: 2021-03-25 03:00:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 00b9240377fdc52bf90817c270f3bc28 SHA-1: 6fe4d059a312f1e2f14ee79889a6df3fed47df95 SHA-256: 5f7bb72855e005d0596455293bcdcdc1cb199435f19184bd15c33d3159d9edc2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains references to book titles and search terms, suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://seumenha.ru/award?keyword=o+reilly+algorithms+in+a+nutshell+pdf PDF link annotation
    • http://zifufarox.getenjoyment.net/animal_cell_organelle_functions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387816/normal_5ff0404e8149c.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/yamaha_timberwolf_250_years_made.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490370/normal_5fc7a8fe334e3.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/what_is_the_social_contract_about.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/g_shock_ga_100_lg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478134/normal_5fce183d3cb80.pdfIn PDF document text
    • http://rijigikesezaga.mypressonline.com/what_gear_should_i_put_my_bike_in.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/porous_medium_equation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471275/normal_5fcaf57a12e03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471514/normal_603e96f9c791a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_6034bfecca648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481053/normal_5fd5f27d74f3e.pdfIn PDF document text
    • http://zevibeponakat.getenjoyment.net/11289263843.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/vovuzize/21408530014.pdfIn PDF document text
    • http://gusubozavagu.epizy.com/31583705619.pdfIn PDF document text
    • http://kuxogazixup.rf.gd/housefull_4_movie_songs_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/nogifunasokede.pdfIn PDF document text
    • http://sekuwomexapa.myartsonline.com/bsw_thread_chart_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/lagu_cinta_luar_biasa_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/lupimi.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_off00012c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C92 5584 bytes
SHA-256: d0d73d8695acfde938674abf6f272542ea866751b7612e949b07fdaf196327a7
font_01_sfnt_off00013f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6A 10920 bytes
SHA-256: 1eae2d2b795472a20cdcad291bda6f9d708506b6d90a92d68689e640b742e6e0

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