Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a21ef4d6298da5c…

MALICIOUS

PDF

75.5 KB Created: 2021-03-05 00:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c33568356eea1a0d702671125db783ee SHA-1: 1b022fb55af2c7508c52a23349008cccfb8c387e SHA-256: 9a21ef4d6298da5c4021d5b27aec0bb303ddf80743b2ee83ce8f66c073710dff
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/wix?keyword=toshiba+55+inch+tv+manual PDF link annotation
    • http://fresh-ita.fun/kifawakoka46iqf.pdfIn PDF document text
    • http://ladyso.ru/inferno_squad_book_summaryvl3gl.pdfIn PDF document text
    • http://esclick.pro/agile_methodology_tutorial_for_beginners_in_telugubudhg.pdfIn PDF document text
    • http://stingeksoj.online/jewuritapopksfth.pdfIn PDF document text
    • http://rodina38.ru/2478283963811pbh.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/jemuroraxnw8l4.pdfIn PDF document text
    • http://mosuxuvemuzuwex.mywebcommunity.org/waste_king_8000_garbage_disposal_parts.pdfIn PDF document text
    • http://acupofjacob.com/3043776849526hc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367019/normal_5fc60561dc738.pdfIn PDF document text
    • http://form-copyrightservices.com/navy_seals_salary_per_monthr9dyl.pdfIn PDF document text
    • http://dotekebenutedex.scienceontheweb.net/mukulakudodupil.pdfIn PDF document text
    • http://tublitalia.fun/2012_polaris_ranger_800_xp_rebuild_kit0ubry.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476750/normal_5fe649f3c1cb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446790/normal_601e0bd18463b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422161/normal_5fd647a48a80e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409417/normal_6023b7d932f3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370540/normal_601fa7d39cfed.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/sazomo/download_longman_dictionary_offline_for_pc.pdfIn PDF document text
    • http://kilarosine.atwebpages.com/38123022920.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/tnau_agriculture_study_material.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_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 5216 bytes
SHA-256: 37ca827f29ec901e76ef9626382c553a2912613df597ce6ca878e47fb794d448
font_01_sfnt_off0000fd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD12 10428 bytes
SHA-256: 0fe1f622ad947daadfaf25c5f7b0f5142955ad468ebf77b1eaf187771e2f7593

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