Malicious PDF — malware analysis report

Static analysis result for SHA-256 b356e7c45659a941…

MALICIOUS

PDF

79.4 KB Created: 2021-05-02 02:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 33ba234df1eb2889c4fb8d497569aac4 SHA-1: b5594ebb89e0200cf556cd2a263a8ff73b3962ae SHA-256: b356e7c45659a94198640a4de9e971dcb723f50e5e8f4d9de91133b049750e54
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs and the nature of the heuristics point towards a phishing or SEO manipulation scheme designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=how+to+pair+jam+classic+bluetooth+speaker PDF link annotation
    • https://cdn.sqhk.co/rorajakura/jjObGge/67791520520.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/jiiLJN6/11894964034.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/i4DjaNW/43062291845.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/dapubukisalirego.pdfIn PDF document text
    • http://kunozoxutokusu.mygamesonline.org/como_salvar_carto_cnpj_em.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb71deac-5427-4a11-aec2-6feec017c243.filesusr.com/ugd/4cd983_294d11ebbf2248d2865801ea6305c3f9.pdf?index=trueIn PDF document text
    • http://melaworogafema.epizy.com/41170955219.pdfIn PDF document text
    • http://kabumosubeno.epizy.com/bushnell_voyager_telescope_manual_78-9565.pdfIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_c7959965868a4fdbb4ece12df7ac94ac.pdf?index=trueIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_93346d57075349ef9b96cb2aa3eded4c.pdf?index=trueIn PDF document text
    • http://kikumofesokir.rf.gd/alert_user_guide.pdfIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_d76616c29c7647db8b45aa6a576b7f23.pdf?index=trueIn PDF document text
    • http://xupuwineris.epizy.com/89115158723.pdfIn PDF document text
    • http://sixiwojiti.epizy.com/mibipibem.pdfIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_b2bddc8002ce434ea2aad8d39e075d8a.pdf?index=trueIn PDF document text
    • http://vuxebezedigelun.onlinewebshop.net/40014438991.pdfIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_5f1fb223b1cb41f28a6fb33718da5b58.pdf?index=trueIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_d9bfadad3cba41da9fd8c8bfe765ee2f.pdf?index=trueIn PDF document text
    • http://kafuvaxuxele.epizy.com/dobedez.pdfIn PDF document text
    • http://zijedan.atwebpages.com/save_the_cat_blake_snyder_espaol.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_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 5508 bytes
SHA-256: 9fa1c92e30820c489f01707cfe2edeca31e98e1a71022831da2ecd94e1002f40
font_01_sfnt_off000108b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B8 11752 bytes
SHA-256: 5319ce5ce383f0e5779525328551b2ac43e257767ff6c74026ee5859ca64a37f