Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4f616b68e8de6c…

MALICIOUS

PDF

119.8 KB Created: 2021-03-02 13:04:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: cb7e0ed86011be3694c4ac6de8c50239 SHA-1: 9f2cc7a00ac8205d2d2eeb23001c81bbf6c8be00 SHA-256: 8c4f616b68e8de6c1533e59545844b3c50fb7ec021e2d5903cfe14a582bb7230
134 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The document body, though partially corrupted, suggests a lure related to financial instruments, aligning with the 'Fake invoice / payment lure' heuristic. The presence of multiple external URIs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://soxebez.ru/123?utm_term=difference+between+bill+of+exchange+and+promissory+note+on+the+basis+of+acceptance PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475847/normal_601fa75c26a0f.pdfIn PDF document text
    • http://burrrhey.tech/zaxibofenavew28khk.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/todepojewukovuxuvokazuwo.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/como_agua_para_chocolate_pelicula_completa_en_espaol_vimeo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376096/normal_5fe9624975cd7.pdfIn PDF document text
    • https://cdn.sqhk.co/lemisobe/p4hgzih/drum_set_for_sale_philippines_olx.pdfIn PDF document text
    • https://cdn.sqhk.co/duzupafuj/GmFmiep/romantic_stickers_2020_wastickerapps_romantically.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/98085580474vwtjx.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/jusexojigonavudifidev.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/iasiajj/zombs_royale_io_no_download.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/gre_test_dates_2021-22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471719/normal_60265ff3caca6.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/Thhjdhe/87675166540.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/the_final_quest_rick_joyner_audiobook.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/axiom_pro_49_power_supply.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rizivubonulej.atwebpages.com/its_called_a_breakup_because_its_broken.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_off0001928a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1928A 5968 bytes
SHA-256: c87e50b431f21cf1e09e54071908f7c68d639e6433f94bddc6be10b66bc1f27f
font_01_sfnt_off0001a6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6D2 12856 bytes
SHA-256: e2e0c889f023cc31b0bb71ce3aafbe244dda941064e1c83b445d17b795b9da41

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