Malicious PDF — malware analysis report

Static analysis result for SHA-256 f02c9b33bc53c45c…

MALICIOUS

PDF

81.9 KB Created: 2021-01-26 09:31:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1437af27409e8c35dcb134da0e0cf3ed SHA-1: e8b2115cab72c81dcc4697519db8c8155e17d463 SHA-256: f02c9b33bc53c45c391b6c81dffca44b142290a2406559747d320de05323285d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that form a link farm, redirecting to various disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://seumenha.ru/wb?keyword=house%20paint%20sprayer%20reviews PDF link annotation
    • https://cdn.sqhk.co/seworani/jcieQDR/contacts_lenses_halloween.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/cfgiibE/zero_gravity_runner_octane.pdfIn PDF document text
    • https://cdn.sqhk.co/volumusigu/zhbyWig/kikotabaxope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_5fd76e1877112.pdfIn PDF document text
    • https://cdn.sqhk.co/sejiragidu/hfAjfxA/35016281654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_5fd61bc8f00e3.pdfIn PDF document text
    • https://cdn.sqhk.co/wunasesev/higrgfE/flip_flops_bar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415327/normal_60001a041bdc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455380/normal_5fff096d09c83.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/zumezeviwakiz/como_atualizar_o_whatsapp_2019_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/christmann_informationstechnik_medien.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/9364774883.pdfIn PDF document text
    • http://safadixuzet.rf.gd/agrarian_reform_program_officer_job_description.pdfIn PDF document text
    • http://bajewilogofiro.epizy.com/battery_saver_for_laptop_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/best_website_templates_wix.pdfIn PDF document text
    • http://repefewuvu.epizy.com/excel_template_for_family_budget.pdfIn PDF document text
    • http://defasawune.epizy.com/bible_study_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/zepefefezuxajow.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_off000103ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 4996 bytes
SHA-256: 7a92bf0993767b33235a86a628d8236e15676e6034ed5ae818499bff04ec14e2
font_01_sfnt_off000114f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F2 11148 bytes
SHA-256: d9910b3620afd33ca04708c591b785f8e2d288c918a9712b65331bfda45eada1

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