Malicious PDF — malware analysis report

Static analysis result for SHA-256 4165eddc34350cff…

MALICIOUS

PDF

72.5 KB Created: 2021-04-07 04:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: bb24f83fede773a2d138b96d0a16b481 SHA-1: 2432752cf9ce4f1ea77aa03e0f394f655c9a94d3 SHA-256: 4165eddc34350cffbd2a3cdb238503b0bfad0bc2253e0a64669edcecca6123d8
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged as malicious by ML classifiers and ClamAV. It embeds a URL that appears to be a lure for educational content, likely to trick users into downloading further malware. No scripts were extracted, but the PDF structure and embedded URLs suggest a phishing or malicious redirection attempt.

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://jacksth.ru/award?keyword=wordly+wise+3000+book+8+lesson+13+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4473064/normal_5fdea386bd60e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459164/normal_5ffe1e0fae5ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_6020722199b92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369336/normal_6050547cecbee.pdfIn PDF document text
    • http://pogofefopi.22web.org/12456761497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_5fd84f59220e0.pdfIn PDF document text
    • http://mosovonetuvu.iblogger.org/zingat_piano_notes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402940/normal_60480a94cdb02.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/nafoxuda/windows_7_ultimate_32_bit_torrent_download_full_version.pdfIn PDF document text
    • http://gofokamerutasi.rf.gd/vozizudizimovojejuvuti.pdfIn PDF document text
    • http://bigumijegesa.epizy.com/fovusatofosonezemales.pdfIn PDF document text
    • http://ravuxigud.epizy.com/79152013943.pdfIn PDF document text
    • http://tefefusojobus.rf.gd/15677912159.pdfIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_78e693daad144ebdb0ac4d80c65fe3df.pdf?index=trueIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_a3a97a48d973464394484889994e95d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/81101167906.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/15719652832.pdfIn PDF document text
    • http://wereguvepowu.epizy.com/66285148426.pdfIn PDF document text
    • http://pokobopuket.epizy.com/vigulumowutorabale.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_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 5788 bytes
SHA-256: 4fe16c858ab2c7f867f6b56362c1d8e0e3a9b292b82ff99ce9d8dd33e23d989c
font_01_sfnt_off0000eec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 11200 bytes
SHA-256: dc268c804dfff1800c0bd0525e445fb6439ac53f51deae21a5399bb4188e6033

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