Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ce2564f0402f9d…

MALICIOUS

PDF

72.0 KB Created: 2021-03-10 17:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cc196a0c2d0227a1c80943f28e49ebed SHA-1: 99fce347d1524485b87db1e993c7bcd9f84a3bdf SHA-256: 33ce2564f0402f9dfeb93167aba34b6db180159cc00dec573744faa867e635fb
186 Risk Score

Malware Insights

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

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 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/award?keyword=the+economist+pdf+magazinelib PDF link annotation
    • https://cdn.sqhk.co/mudinaxape/ggMlhjd/the_pch_app_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/donuvoduvedo/gjR2jbJ/yellowstone_volcano_facts.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/electronics_book_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/KuFjdhg/fabfitfun_winter_2020_spoilers_customization_3.pdfIn PDF document text
    • http://kekewawoxugar.sportsontheweb.net/electrical_technician_resume.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/18091660533.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/3ifH1je/my_back_pages_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/lewuravasu/sgi3iaT/67549972574.pdfIn PDF document text
    • https://cdn.sqhk.co/bunigenozav/jcsheia/86209202554.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jafesok.epizy.com/laxomoloxavopagureg.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_664e46ada4f44dedb90d1790dc88b40d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/jest_test_coverage_report.pdfIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_097b45ea8f14472b8a4ed941b82efb54.pdf?index=trueIn PDF document text
    • http://sajufevamofu.epizy.com/cartoon_movie_making_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/wumutowexekari.pdfIn PDF document text
    • http://jujobope.atwebpages.com/cancer_data_management_salary_2019.pdfIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_fcd9372d1a8f41428242fb78b029859a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/android_10_mi_a2_update.pdfIn PDF document text
    • http://zefabufuz.epizy.com/what_was_the_importance_of_the_agricultural_revolution.pdfIn PDF document text
    • http://lafagelupuf.myartsonline.com/1428163340.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/baroda_pioneer_mutual_fund_common_application_form.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_off0000dbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD 5612 bytes
SHA-256: 6ce597c0d32db25309e8450264a45e4ba4ccdac0a6b6caec3808e7b923332883
font_01_sfnt_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 10332 bytes
SHA-256: 73f641537bf9ffc1221eaff32f4e4b2dcfda43541941eef6b4833b2958f78502

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