Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3a867dbbd9817d…

MALICIOUS

PDF

77.8 KB Created: 2021-03-29 23:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c3098cd1a1af63e4fcddb72bd544f52c SHA-1: 549cd40ca8a80a61232a29aad9ae284118dd600d SHA-256: be3a867dbbd9817d74f71b21c301311e7acd48145700046331b7825141c7464a
126 Risk Score

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 0.9993

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://xajibur.ru/award?keyword=hunger+games+book+in+spanish+pdf PDF link annotation
    • https://cdn.sqhk.co/kominepoli/2VJyidJ/motorcycle_speed_limit_in_slex.pdfIn PDF document text
    • http://lerawutevokaj.iblogger.org/61089060375.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/Ki6rhhf/65397781282.pdfIn PDF document text
    • http://xijewaka.22web.org/vemokamozanigu.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/pert_network_diagram.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495246/normal_6039a2d979341.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456393/normal_5ffd59cfe1803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385030/normal_5fd7ecb2377b5.pdfIn PDF document text
    • http://vorusobowa.66ghz.com/weekly_math_review_q1_3.pdfIn PDF document text
    • http://vitodibiwanezej.mypressonline.com/biomedical_waste_management_assignment.pdfIn PDF document text
    • http://positarinirib.22web.org/97919909910.pdfIn PDF document text
    • http://didibemez.scienceontheweb.net/chrono_trigger_remake_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/i3ijfje/rally_s_coupons_2020.pdfIn PDF document text
    • http://wubujonil.getenjoyment.net/ansiedad_en_nios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457006/normal_5fee4e2f5cf5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_141f315fc47e4cf3ba34d6fb8c711761.pdf?index=trueIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_a03e564895234ea2b5af1d73567f6c72.pdf?index=trueIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_43e5d0ec81ca4ce3b3b1ec635ae37720.pdf?index=trueIn PDF document text
    • http://gowuzabe.epizy.com/is_sharp_a_good_tv_make.pdfIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_e5ac96be4bb545f2a22983b3ce782545.pdf?index=trueIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_64804214daad4183b4ac6861f347bea6.pdf?index=trueIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_94445b84f36042c49edf6896e493ecc9.pdf?index=trueIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_edcd16dd50df4f60be43bff9c6645ed4.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_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 5588 bytes
SHA-256: a6410e919ddd37d73818a2d603050d15169f6b887a1252b4cee713f34df10c7f
font_01_sfnt_off00010560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10560 10744 bytes
SHA-256: ef4f540fad61cb648870f992336c4e7fd3a7546148e196a94af9f2d7fa6bd77f