Malicious PDF — malware analysis report

Static analysis result for SHA-256 c343bf66e6fa32d8…

MALICIOUS

PDF

75.6 KB Created: 2021-03-27 14:48:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9f05c186152f9080036437fb5efb4179 SHA-1: 154a4eec9525e8f6a1b1096580d1331f331c874e SHA-256: c343bf66e6fa32d8edd00f114e55d5c72ae320183469ff0be376067981a292a9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=titration+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403807/normal_605b84cdd183d.pdfIn PDF document text
    • http://rivorumijarugen.22web.org/amazing_facts_about_space.pdfIn PDF document text
    • http://sutiwejepeb.22web.org/xojinaxolokeforilo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419413/normal_5fe0a98a58953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452400/normal_60239a6a6ab83.pdfIn PDF document text
    • http://moluroniv.22web.org/76775378094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488604/normal_60191a9790cb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_600f13848e23e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366969/normal_5fcf059d779bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393483/normal_5fff839477580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492246/normal_5fc767e01fedd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421944/normal_603b4691a4a91.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lidagubokog.epizy.com/abrazadera_para_unicanal.pdfIn PDF document text
    • http://negubikalijewu.epizy.com/20825302557.pdfIn PDF document text
    • http://pazasirar.epizy.com/national_filmfare_awards_2019.pdfIn PDF document text
    • http://weparizik.epizy.com/walt_disney_concert_hall_seating_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/ib_biology_mesocosm_lab_report_example.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/formation_agriculture_biologique_france.pdfIn PDF document text
    • http://nejatunopux.epizy.com/47474316594.pdfIn PDF document text
    • http://vudubozudavoso.rf.gd/rivudeg.pdfIn PDF document text
    • http://zivuneko.epizy.com/keladevoruzejaregowab.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_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 4848 bytes
SHA-256: db03d78ae9b6f8c8d5f864a94336edd7958e3530c43cfa81832e8fd4906d1d76
font_01_sfnt_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 11000 bytes
SHA-256: fc3f5b572311d1a5031eea274152cacb1884b5c75a480c618447c79e22953936

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