Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0cb57fd3d294574…

MALICIOUS

PDF

76.3 KB Created: 2021-03-23 12:54:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3425a05833f9fecba06af90138edd4e3 SHA-1: 22b1bd7e44796532e2ad3dcf45ed3d55dc39e624 SHA-256: e0cb57fd3d294574247396032de36cb89c53b0a8fe05f81b1a8623330cde812c
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded URIs suggest a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=glencoe+biology+textbook+2017 PDF link annotation
    • http://rifubabesepa.iblogger.org/calorimetry_worksheet_with_answers.pdfIn PDF document text
    • http://difijeso.iblogger.org/el_alquimista_audiolibro_descargar_gratis.pdfIn PDF document text
    • http://indir-kazan.com/what_is_considered_indirect_exposure_to_covid228s3.pdfIn PDF document text
    • http://fartook.online/126316459692ktab.pdfIn PDF document text
    • http://podjem2.club/ecg_feature_extraction_using_wavelet_transformr1snm.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/chgXVjf/bufifovokazavute.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/iijfhhI/advertising_agency_nyc.pdfIn PDF document text
    • http://nakanilo.club/gotovozafoxodikojuger3d1i9.pdfIn PDF document text
    • http://getyourscore.info/gejawoxorh1ioc.pdfIn PDF document text
    • http://masalev.ru/545735410198uljb.pdfIn PDF document text
    • http://peludofnor.fun/17793915275enc46.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
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_fa30479bfc0849789020629b0dcd4e19.pdf?index=trueIn PDF document text
    • https://013c3ecd-17dd-4738-ad87-554153c764a5.filesusr.com/ugd/36f25b_6d3dad5a043540709a7dcf2b61793c1e.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_70dd1729ba9b447a91b1b473c8b91d2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1783f3db-241f-470e-bfca-784664cb1330/how_to_order_online_ikea_malaysia.pdfIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_3b34da7e88f84eb6893a8483f9eb058e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b74ecbb0-c9eb-444e-bd6b-79ddeca1b7d5/how_to_change_holes_on_golf_buddy_voice.pdfIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_14e8369677b04075936bcf1b8b3ece6b.pdf?index=trueIn PDF document text
    • http://xezeruv.epizy.com/pepowajudol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50657bbe-8f45-444d-9b3f-0a4f2d25507f/52271386424.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 5080 bytes
SHA-256: 037f86dd3d58984b2d71757724c8d0354115b3607d2b41987f2e37ea03cac625
font_01_sfnt_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 10936 bytes
SHA-256: 4794ee3a2aa234c3f0721ea31b3b656ac98a1ba46b7a783964a29fe011307215
font_02_sfnt_off00011444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11444 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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