Malicious PDF — malware analysis report

Static analysis result for SHA-256 61989494566849c5…

MALICIOUS

PDF

151.9 KB Created: 2021-03-09 15:25:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8058340eea26082a0fa1b86f0c53b194 SHA-1: 2a45ae162a6e678bdea0a3e5943d4a26b145ad60 SHA-256: 61989494566849c5c5dbd3820818b0a67c8fa2880eca53547397bbdd00237bf8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL pointing to a suspicious domain ('lozipotod.ru') that is likely used for phishing or to serve malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further suggesting malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://lozipotod.ru/strik?utm_term=timex+marathon+watch+turn+off+alarm PDF link annotation
    • http://kernig.store/musculos_paravertebrales_origen_e_insercion1n9fn.pdfIn PDF document text
    • http://dazixetenulega.22web.org/change_schlage_lock_code_smartthings.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447276/normal_5fcb04ace165b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_5fd136040d233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5fd15b4cc8e9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447085/normal_6037e89adf895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484631/normal_602f7fdda754c.pdfIn PDF document text
    • http://tubezadobuzaro.66ghz.com/standard_fitted_cot_sheet_size_australia.pdfIn PDF document text
    • http://vclean-sale.shop/31556201723lsr5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_60321427479c2.pdfIn PDF document text
    • http://tufilevazoropiz.iblogger.org/openshot_video_editor_exe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_60164cbd2bcff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_600a0336224e6.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/wexukufedepim/schaum_s_outline_mathematics_of_finance.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_8ac75a77504644d5868dd83f45182194.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_1fc2883c6cdd418a9bdb413a3f508eaa.pdf?index=trueIn PDF document text
    • http://vopisatewegom.rf.gd/12874527374.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/sobemulavid.pdfIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_14dc95f447aa4e72b9e8e5fbd54b6d29.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/verirejon/multiplication_as_repeated_addition_worksheets_year_2.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/jizonamusemufasenada.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_off00020983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20983 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off000213c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x213C6 5052 bytes
SHA-256: 23701603aadf1baef9f0969f4184f8b4416237b3fd4cc4b9a6a3c6d4702ac902
font_02_sfnt_off000224e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x224E3 13684 bytes
SHA-256: cb75de10723533c857c093f3a0710050700a721494578e8411c2c6d3b05f4773

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