Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd4f8de82106962…

MALICIOUS

PDF

68.7 KB Created: 2021-02-21 07:23:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 77cfa1f11e9dbca369a77c2d8be35b07 SHA-1: b238a98b2aed1210e9850053efe72fba2711d0fe SHA-256: 8cd4f8de82106962e39244bc6aa0209c4e98e7649412752218d0907df2a6e295
156 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 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 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.
  • 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://maypoin.ru/123?utm_term=does+popeyes+have+a+senior+discount PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464863/normal_6006d7dc7c89a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480580/normal_5fd96c8e19c60.pdfIn PDF document text
    • http://free-at.pro/gift_certificate_template_pages_freeyeoo2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505326/normal_5fe8274fa692c.pdfIn PDF document text
    • http://livecopyrightverification.com/car_wash_incident_report_formyv1fd.pdfIn PDF document text
    • https://nixakozuver.weebly.com/uploads/1/3/4/6/134626944/buvib_gexebawevezafex.pdfIn PDF document text
    • http://wowitaly.space/engineering_ethics_report_example97cgi.pdfIn PDF document text
    • http://magnifioco.site/card_collection_box_wedding_glasskwyef.pdfIn PDF document text
    • http://meriline.store/praise_him_praise_himah6e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388424/normal_5fde8ddd6c683.pdfIn PDF document text
    • http://copyright-help-center.com/manitoba_election_2019_party_platformsx922q.pdfIn PDF document text
    • http://tazijiga.22web.org/buvepiju.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/wekibik/ruguzadekubaxoviresut.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/michaels_chipboard_sheets.pdfIn PDF document text
    • http://torowenakatum.epizy.com/78285081505.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/list_four_features_of_a_spreadsheet_application.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/rodeo_stampede_secret_animals_guide.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_off0000d074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD074 5288 bytes
SHA-256: fc54de00ec6b5490e6f5e05a3f9338dd032722900c8bba8f7a336c0c7e163212
font_01_sfnt_off0000e286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 10424 bytes
SHA-256: 73e231dd6ef66ace0873394d24f57693abe9c88e84a58d8a13885f0017f7e70b

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