Malicious PDF — malware analysis report

Static analysis result for SHA-256 36870ebb182ee723…

MALICIOUS

PDF

69.3 KB Created: 2021-03-24 10:45:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 42135490c10f5189b599a2a24ba5908a SHA-1: 5041ef1594d6eda8331a71ac4c9d406b3fafaf21 SHA-256: 36870ebb182ee7235bc19e93a40ebc809081d0a648542ff6b27d824c45ec3f99
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/wix?keyword=cats+in+the+kettle+at+the+peking+moon PDF link annotation
    • http://xuzerujagojagip.scienceontheweb.net/74407945900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459929/normal_605068cc82753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415519/normal_6023d846f26e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1e8813a-d7fa-405b-b268-3c717e797829/67953922018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95f41c0-104d-4b78-be39-7ee7afc7055f/8688419716.pdfIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_0a3153d4471c4573b64d9ac30968b696.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca7d5bee-c8de-4eef-9c63-15fd61a7295e/93923840308.pdfIn PDF document text
    • http://roxujewov.myartsonline.com/bukiv.pdfIn PDF document text
    • http://fuguzametekobo.myartsonline.com/ca_dmv_form_dl_44.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/bixok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/621a4fd1-c367-4545-8dfe-f58bf9fce16d/nepupegekosorupasevi.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/exerpeutic_recumbent_bike_4000.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/90244760199.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/breville_tg_870_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cd39704-c508-49de-b8d2-14ab34f6aef5/how_is_annual_leave_pay_calculated.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c030fb8-86bc-4c8c-b919-02036ab46977/diablo_iii_ps4_multiplayer_offline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf26dd2a-9543-4b54-b93b-6f99348a05e5/amplificador_alpine_mrp-f300.pdfIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_6c84a77b5f89490bacc276d097ec014a.pdf?index=trueIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_59aec319b625488181609911fc77e4bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kosamupim/beat_maker_apk_app.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_off0000d44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44C 5104 bytes
SHA-256: 675027ba3a9d3ca99c4a763205390da990e0fdf0d5a2b4eb64e4fb968322407b
font_01_sfnt_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 9996 bytes
SHA-256: 58f65a6a8bac4a4f97b90533fb0a68690dd9f5e18cf9a7f4284fe7c75acecd74

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