Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b481e72e60153a…

MALICIOUS

PDF

79.5 KB Created: 2021-03-07 19:56:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: da41329e06049a372594fb2dcbc44c21 SHA-1: 3445bb5ad4f44d38a4b9e05d3a7b39c49bf5ac7d SHA-256: b3b481e72e60153aac39cdcf47c1f631e590b5d327ec83adf7432b0bb781130c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's strong positive prediction suggest a malicious intent to redirect users, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/123?utm_term=how+hard+is+the+cpc+exam+2020 PDF link annotation
    • https://cdn.sqhk.co/letijefa/3gjcejb/duck_life_space_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404990/normal_6000b16a29e1a.pdfIn PDF document text
    • http://artrosil.xyz/kofivogonosipulawobisif5yrn.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/MjhhjOW/sdge_power_outage_laguna_beach.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423154/normal_6040fa32edd2b.pdfIn PDF document text
    • http://evatopshop.xyz/17045514034r05cf.pdfIn PDF document text
    • https://cdn.sqhk.co/simunenij/ieMmTij/soxivegiwugezupawefegob.pdfIn PDF document text
    • http://podarokinsta24.online/does_the_pioneer_mosfet_50wx4_have_bluetooth2f60f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_5fd62250a8ee8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_7ee361249b714a9ea1f17e8f485bdcd7.pdf?index=trueIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_b23d02e76df54d3da5098bd3bc04604a.pdf?index=trueIn PDF document text
    • http://dumizalu.epizy.com/takeverenumita.pdfIn PDF document text
    • http://texazufuvo.rf.gd/how_did_ralph_change_in_chapter_5.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/waridoris.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_9dd53f1256844362bbaf5e7cd7ab8fec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lulelepese/27303952244.pdfIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_c6e0c4b70ed7445aa3ea84eb1052a50a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tazopaju/sam4s_er-265b_cash_register_manual.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_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 5676 bytes
SHA-256: f7f83071160af3953ba5c33b007a922739edfd107c61e73e7042198f0acda28b
font_01_sfnt_off000109c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 11628 bytes
SHA-256: fb82dbeab6fc2ff25730a7d1d35650726427a404623a4a2fd562f8b527f2ab2b

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