Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdcbcd21356bc45e…

MALICIOUS

PDF

74.8 KB Created: 2021-03-11 12:31:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e7dc83ff849149a41e49d18ab4758c68 SHA-1: 130abb492aa0541af2caa0bb9d5103bf4c0c338d SHA-256: fdcbcd21356bc45e60f84ba1effbdf6d20d489028518d7b4e0ff528538efc10c
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 0.9999

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://vilenefex.ru/123?utm_term=nutritional+information+for+sweet+potato+brownies PDF link annotation
    • https://cdn.sqhk.co/dipasupor/sagevgd/nolejiw.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/fmgjrhd/jurassic_survival_island_dinosaurs_craft_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401716/normal_6041c049ccade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480149/normal_5fdc48263c049.pdfIn PDF document text
    • https://cdn.sqhk.co/rogolafu/eVjahha/puworozatanufiledegedot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450160/normal_5fdee608e364e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427295/normal_60243af057c19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406497/normal_601d85a909284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386354/normal_603cc03e2148e.pdfIn PDF document text
    • https://vuwonogi.weebly.com/uploads/1/3/5/3/135300132/8754911.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453741/normal_5feb4076b2721.pdfIn PDF document text
    • https://kilekawu.weebly.com/uploads/1/3/4/8/134857711/cfb0e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453906/normal_5fc8597c57024.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/dejolavubukugeb/ganulemovukibumimope.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/vodifu.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/comparing_and_ordering_fractions_worksheet_5th_grade.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_d5e5d2fbf3bc40a1b6a33956ff495b9b.pdf?index=trueIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_6fcd9cbf3134471498ef5b2408343e27.pdf?index=trueIn 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_off0000e73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 5248 bytes
SHA-256: c108129daf24149ceb39de8ca4350d54830e4c429369d631289350543a2fd23c
font_01_sfnt_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 10792 bytes
SHA-256: 3a796207708dbead569829001d31ced1a098eeb92add1291c866d7f961a98997

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