Malicious PDF — malware analysis report

Static analysis result for SHA-256 133fa18aa0c83a2e…

MALICIOUS

PDF

72.4 KB Created: 2021-03-23 03:14:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b0d5dc06e8e468a0e6999a6141a26f8b SHA-1: b56d4955fb45276e997abb57eafd41833ce002a6 SHA-256: 133fa18aa0c83a2e151c1b52b95e36343ff7a428e5d5f96437012798a090d696
126 Risk Score

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 0.9998

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://resalured.ru/strik?utm_term=how+to+write+hobbies+in+introduction PDF link annotation
    • http://tiktokhd.design/baseball_t_shirt_design_templater6e55.pdfIn PDF document text
    • http://bighome.space/80159248243igx8t.pdfIn PDF document text
    • http://gnatural.space/oral_b_pro_1000_rebate_walmart0dg52.pdfIn PDF document text
    • http://jilet1.club/maple_leaf_rag_sheet_music_easympyus.pdfIn PDF document text
    • http://wozovumorawoka.sportsontheweb.net/38981289848.pdfIn PDF document text
    • http://muwikobifeke.22web.org/badizaroduvusizeda.pdfIn PDF document text
    • http://good-production11.site/93505732941qeo65.pdfIn PDF document text
    • http://beamorem.com/ali_g_indahouse_yify75eww.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/turtle_beach_420x_mic_not_working_on_pc3m6fc.pdfIn PDF document text
    • http://loveantravel.xyz/pefebepozunofn84ym.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vorisenunajix.myartsonline.com/67812743645.pdfIn PDF document text
    • http://vajitefafuxuz.epizy.com/brain_waves_pro_binaural_beats_apk.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_5ab9fdac5ff045c5bb76b7d3db17787e.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_49a86390246f413ea6962e4c920e96e7.pdf?index=trueIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_cc7b0d975d734c949125faee8b953997.pdf?index=trueIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_02c728ba93f84899a109e75d54df287a.pdf?index=trueIn 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_off0000ddb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB3 4976 bytes
SHA-256: 3e515118bbee3095a73c52a74f40984641583534b6c6fe200d48ee5dada9e43c
font_01_sfnt_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 10748 bytes
SHA-256: 89afe2505de2addf851109185bcd603ef1b9af4683d37ece5b499229f2cda774

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