Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c599b8d0e1121c…

MALICIOUS

PDF

72.0 KB Created: 2021-01-27 04:52:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ab41d0028b380afeb4906ce0eac67c9a SHA-1: cc594ac66db3f15a07e738c7c242fe1e86bb19fc SHA-256: a0c599b8d0e1121ce751e7805da21bd3a8c490bd0cd384c5cd97c4b30e7347b5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs pointing to disposable domains, flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and URI patterns suggest it's designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=best+place+to+farm+argon+crystals+warframe+2019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447466/normal_5feb1e6515d99.pdfIn PDF document text
    • http://koteyarn.moscow/90015597183m739z.pdfIn PDF document text
    • http://pedrons.space/cultural_anthropology_a_problem_basezwv3q.pdfIn PDF document text
    • http://stebsmeh.space/pejiriwoxixemiuy4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444117/normal_5ff8bdfe5ebf4.pdfIn PDF document text
    • http://rotixumuzu.22web.org/nubogerililixeruzafe.pdfIn PDF document text
    • http://fijixedi.22web.org/l_c_b_ka_full_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454988/normal_5fd61353e85ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://romipozaxijida.rf.gd/capital_group_american_funds_beneficiary_change_form.pdfIn PDF document text
    • http://dudolisimak.epizy.com/plastic_dust_sheets_toolstation.pdfIn PDF document text
    • http://dujisuga.epizy.com/all_sheet_metal_worker_jobs_toronto.pdfIn PDF document text
    • http://gusizozubamu.epizy.com/diwali_wishes_email_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/xumubetorafijaveni.pdfIn PDF document text
    • http://zifasodokid.epizy.com/pawuforozinegusinonetepo.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/commonly_confused_words_worksheets.pdfIn PDF document text
    • http://jisevara.rf.gd/construction_company_responsive_website_template.pdfIn PDF document text
    • http://dogabofeki.epizy.com/gobonudavawibovali.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_off0000d9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B6 6060 bytes
SHA-256: 118f7536bf8ac8a8a9b23ab1724933d0968aa04a8b8fe7102dbf248287335de7
font_01_sfnt_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 10584 bytes
SHA-256: b38754759b5d365fdc28099c45a35ac0ab6ff21e9a597e1c378413d6b393872d

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