Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe07a9ad1a35bb4…

MALICIOUS

PDF

85.8 KB Created: 2021-03-23 18:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 721339790b2bfd5eb3727eec8a75cbc9 SHA-1: c9c8a1bd51dde12a763ee035e47b3bc0ed8312a7 SHA-256: 5fe07a9ad1a35bb4c094d9d0f5846608ce7da9d965710dab57cac28db7932f21
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a search query, reinforcing the lure of finding a poem PDF.

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://seumenha.ru/award?keyword=paraiso+perdido+poema+pdf PDF link annotation
    • https://cdn.sqhk.co/labifikup/4jdhbSm/53842845839.pdfIn PDF document text
    • https://lubexunomug.weebly.com/uploads/1/3/2/6/132696146/9437345.pdfIn PDF document text
    • https://wuwotozon.weebly.com/uploads/1/3/4/3/134315251/105c272fa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_6042c95843f63.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/jhKJjgy/99985747573.pdfIn PDF document text
    • http://magefaro.22web.org/how_to_get_free_food_online_delivered.pdfIn PDF document text
    • https://sajakuvidosub.weebly.com/uploads/1/3/4/4/134496924/7834717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_603b6e1328b4d.pdfIn PDF document text
    • http://fosireditoj.mygamesonline.org/detosotugimukosaju.pdfIn PDF document text
    • https://senorori.weebly.com/uploads/1/3/4/6/134641151/2071893.pdfIn PDF document text
    • http://fujenotaj.22web.org/85816858947.pdfIn PDF document text
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/pogiludawumo_zerol.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/dusopegudiretu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vifidumefitur.atwebpages.com/12170322106.pdfIn PDF document text
    • http://kedixiravupit.epizy.com/aotearoa_fisheries_limited_annual_report.pdfIn PDF document text
    • http://fuxunowelujuxa.atwebpages.com/what_do_u_mean_by_a_quick_study.pdfIn PDF document text
    • http://xilawon.epizy.com/bangladesh_government_calendar_2019.pdfIn PDF document text
    • http://nomudozagaximat.epizy.com/search_engine_optimization_tutorial_point.pdfIn PDF document text
    • http://xadifoduboboriv.rf.gd/arduino_starter_kit_book_download.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/how_much_does_a_retired_coast_guard_make.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_off00011068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11068 5156 bytes
SHA-256: bd926eac7855103e845ad5b5b33efd270035e2894d32443068073082b2e3cc9b
font_01_sfnt_off000121e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E0 12772 bytes
SHA-256: b28fd1bde6f139f625ee4176633b3210d0bdc9bde8333810191fe5df562a3f6f

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