Malicious PDF — malware analysis report

Static analysis result for SHA-256 baafb8a129134ef0…

MALICIOUS

PDF

78.4 KB Created: 2021-05-03 18:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a80f5bf9e0dd6670308630a7d62ad758 SHA-1: ce8504e82febae31fbfadc50d00883d1714a859d SHA-256: baafb8a129134ef06d603c9ea9a964ce11335703e9e3f7744a6ca4f1575170ed
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 hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to exploit users via web redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://jumiwimov.ru/strik?utm_term=lineman+and+cableman+handbook+pdf PDF link annotation
    • http://mkuu.club/gupuvu39vkf.pdfIn PDF document text
    • http://vozuzutiwajuzip.getenjoyment.net/court_of_mist_and_fury_series_order.pdfIn PDF document text
    • http://morpeoplelife.ru/wenoputuken170ey.pdfIn PDF document text
    • http://clyb-wylcan3.space/kendo_spreadsheet_column_widthil84t.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/sufugalikowupasili.pdfIn PDF document text
    • http://fodelogutejamit.getenjoyment.net/ielts_writing_task_1_2020.pdfIn PDF document text
    • http://springtea.space/how_much_is_a_2006_honda_civic_coupe_worthu3zm3.pdfIn PDF document text
    • https://nabisafuv.weebly.com/uploads/1/3/1/4/131413222/7907381.pdfIn PDF document text
    • https://kisuwirabavaruz.weebly.com/uploads/1/3/3/9/133999170/bolavetosoj.pdfIn PDF document text
    • http://brumbum3.xyz/zijewanadokikukuvufadm9sjh.pdfIn PDF document text
    • https://nilanifuk.weebly.com/uploads/1/3/5/3/135322299/9232380.pdfIn PDF document text
    • http://vorotiw.iblogger.org/automower_315x_user_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://besafetusupug.atwebpages.com/financial_modelling_course_fees_in_indore.pdfIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_b5f54cfbe9424dd0ac723372114003a6.pdf?index=trueIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_f6ece7af58684574b6cdf493873b4e27.pdf?index=trueIn PDF document text
    • https://4d3f6715-1114-433d-a4b7-45a5e22e3858.filesusr.com/ugd/ce86b4_a2c63d6a3e98472aafdc40d1b33531aa.pdf?index=trueIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_b18c663b097d40b6aa373f131b089eaa.pdf?index=trueIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_a059d0d5ff284137b71ff8aec0101fad.pdf?index=trueIn PDF document text
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_b5b82ad89cee4f628f9ede0d7e3a78e0.pdf?index=trueIn PDF document text
    • http://zalerifi.rf.gd/31118083314.pdfIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_7e7506ebbbfa4f56b1530e95f1c91afd.pdf?index=trueIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_4ef3a1c95943481e92a6a15dc0dc1520.pdf?index=trueIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_27d2f95ea69f40f58f63d70402d52dc1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 4972 bytes
SHA-256: 1c764023c9c3c95217101d8a3f283a7ad964bc3e2e36b54eae2bde7bf47c84bf
font_01_sfnt_off0000f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 12036 bytes
SHA-256: fd95bc9ec4f0bb88624be22b4d66ed2c860143f925e12490257d3cb8796009d1
font_02_sfnt_off00011def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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