Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af78f4f435ba14e…

MALICIOUS

PDF

75.8 KB Created: 2021-02-27 15:23:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d2dc187fec3a38c07446c73fe0db0ee8 SHA-1: 309e40bce1672fbf452ede1d44e3f31b9e561fba SHA-256: 0af78f4f435ba14e375bd2e0618ff6497a0c9e44b75f6331c85e7955b0300f00
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, with a primary one pointing to 'kuzutuzo.ru', suggesting a redirection or download attempt. The PDF's structure and numerous links indicate it functions as a link farm, likely to obscure the final malicious destination and evade detection.

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://kuzutuzo.ru/award?keyword=operating+system+concepts+9th+edition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481695/normal_5fe599fec56f0.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/sirusufarowoje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449629/normal_5ff47b80018a5.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/68284388185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489977/normal_5fdc359e0083f.pdfIn PDF document text
    • http://vvinorama.website/neonatal_meningitis_treatment_guidelinesatsds.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498330/normal_5fec0e2247963.pdfIn PDF document text
    • http://datifuxevewa.22web.org/23614107795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_6025775adaffb.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/how_to_change_4_blades_on_a_honda_lawn_mower.pdfIn PDF document text
    • http://numberoone.xyz/sql_server_2017_administrators_guide_download0rm7s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471235/normal_5fd965c0e5daa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479470/normal_603432e398dbf.pdfIn PDF document text
    • http://xulonagubalipa.66ghz.com/driving_school_online_test_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408981/normal_600a6980bae4c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jirabasojexosud.atwebpages.com/aftermarket_parts_for_iphone_5.pdfIn PDF document text
    • http://gizugutopaf.epizy.com/49934168031.pdfIn PDF document text
    • http://bozalusi.epizy.com/75778835002.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/henkel_corporation_msds_sheets.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_off0000ec03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 5740 bytes
SHA-256: c7d8f726760fa2c88b01292fd7e343ad260c153375f0ed340bb49fb9409d016d
font_01_sfnt_off0000ff63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 10196 bytes
SHA-256: 5f6999d3578b683dac46d2b84000421daedeed0822f05973857c9dbaa316065c

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