Malicious PDF — malware analysis report

Static analysis result for SHA-256 190b9f6230af97d0…

MALICIOUS

PDF

76.1 KB Created: 2021-02-20 05:39:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: af8703a16eea187935181163eba2fe21 SHA-1: 93af56200e3fd8b5523b25798306e3bfd164a04a SHA-256: 190b9f6230af97d03d22341a48e5fef8c97abf3c82af31f5eed29fc4ec0e6e99
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text related to a video game guide, likely a lure to entice users to click on the malicious links.

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://bologen.ru/wix?keyword=god+of+war+3+remastered+trophy+guide+and+roadmap PDF link annotation
    • http://vudujupuboneg.22web.org/casio_edifice_efr_539_manual.pdfIn PDF document text
    • https://piximemob.weebly.com/uploads/1/3/4/3/134371032/xoferizunabif.pdfIn PDF document text
    • https://bovuxugiz.weebly.com/uploads/1/3/4/9/134901291/padogitidex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404490/normal_5fe6c55670fa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_600f11a6cfe18.pdfIn PDF document text
    • http://pofepan.iblogger.org/27489612742.pdfIn PDF document text
    • http://bojelopiroxi.22web.org/30942282465.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408992/normal_60122c823748b.pdfIn PDF document text
    • http://sozefavi.22web.org/vedas_in_sanskrit_with_english_translation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bigisewolax.epizy.com/kindle_books_online.pdfIn PDF document text
    • http://zukagebogewivur.epizy.com/verizon_router_upnp_settings.pdfIn PDF document text
    • http://wuvasof.epizy.com/56194030307.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/apresolina_50_mg_bula.pdfIn PDF document text
    • http://xegefonupekowa.epizy.com/guxerarodoxibun.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/hernia_femoral.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/bridgestone_tires_rebate_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/knoll_inc_annual_report_2018.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_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 5812 bytes
SHA-256: afac8b70eef89aefc2c8a91f2eeb64b678e7fa1b23cd2d72890c7be99cc77882
font_01_sfnt_off0000fe2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2A 10824 bytes
SHA-256: 8242ed57bd41fe50f7e164fa557caebf49f9260a356953508fd66a6e37c89a72

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