Malicious PDF — malware analysis report

Static analysis result for SHA-256 0271d21dd7751c86…

MALICIOUS

PDF

74.8 KB Created: 2021-05-14 01:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a0d5a1f9600a694ea64f5c711cbd0194 SHA-1: 70c5a78296e8f158a2c52db1af4eb980b1d0ba6e SHA-256: 0271d21dd7751c8699274786e3eb777fb9bd29cc4a7172266cc47f7219de7079
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 0.9997

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://botokaw.ru/strik?utm_term=verizon+fios+home+page PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489263/normal_5fe4fb9cdc47f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5fd610cbc62c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386829/normal_5fd68e22c38ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450046/normal_5fed18d1a0a0d.pdfIn PDF document text
    • https://javekekowunafot.weebly.com/uploads/1/3/5/3/135324960/sazunala-nofuxenekero-futokarazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383913/normal_601e722d55fd0.pdfIn PDF document text
    • https://feverawujebuv.weebly.com/uploads/1/3/5/3/135314909/49582.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407724/normal_5fcf59a63c601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_5fe802b0aa5f4.pdfIn PDF document text
    • https://tanoviruxejalun.weebly.com/uploads/1/3/0/7/130775892/supize-tuzegobipafew-jodetakasemi-kumiwe.pdfIn PDF document text
    • https://pozimetotekiv.weebly.com/uploads/1/3/4/3/134339641/ec1f2ebd66e113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405459/normal_6018b3ffd7a55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484834/normal_601a5cbc3c0c2.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/tezofuretejom/irregular_verbs_worksheets_elementary.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/19319465993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26affe6c-e18d-4331-9722-ef7dbab804bb/tivovarutefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce1e848-1bbc-4e54-8717-2834afc3198d/effect_of_sugar_on_yeast_fermentation_experiment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/611e23d6-477d-4d9c-b415-b88974e8e0e0/how_to_prepare_for_a_quantitative_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c05643-62c7-422b-8445-bc02936609ff/lurogudav.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/whats_the_difference_between_vitamix_5200_and_5300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a267f1f5-96c5-4554-8428-6babacd61e10/bosekinuponawojuzesojotem.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_off0000e5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F6 5296 bytes
SHA-256: 02ce6edb9e96ffa7be16fb1f4318e446de705f70c6608169a4f8e115abf993de
font_01_sfnt_off0000f7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 11196 bytes
SHA-256: b4160bd288ce226193d22aed1f8b4d2e36a3cacab01c4c4b7356a3ea29e0b4be