Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2619a09f394d3b…

MALICIOUS

PDF

84.6 KB Created: 2021-05-28 20:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 444a8cd25a641ed208ca860e303aac19 SHA-1: 987043cbc7d2e5050cfa0ee6cbbac7146c81802a SHA-256: 8c2619a09f394d3b30346d707fcd6680b0036b1c5e3cd9a6ce515e07485b08b3
194 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the heuristic findings of a link farm and urgency lure support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=first+written+warning+letter+template+south+africa PDF link annotation
    • https://rivoliga.weebly.com/uploads/1/3/5/3/135311175/365f2d7fed498d4.pdfIn PDF document text
    • https://tekadepaja.weebly.com/uploads/1/3/4/3/134341299/davinovafiven_nefatasof_ruparut.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/7126804.pdfIn PDF document text
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/xepiwotu.pdfIn PDF document text
    • https://vewejefimubi.weebly.com/uploads/1/3/4/1/134108794/futelaresofopogunoju.pdfIn PDF document text
    • https://nirilepewo.weebly.com/uploads/1/3/4/6/134657632/kebozanagazet-fazoborevifu.pdfIn PDF document text
    • https://suwanozafedo.weebly.com/uploads/1/3/4/5/134587456/c1842924e478.pdfIn PDF document text
    • https://beliwiratode.weebly.com/uploads/1/3/5/3/135391567/vanosularetavigete.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/f7288317-6b6b-44bb-8da0-136cedc16d1b/85585099284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbe6794b-6b29-4dfa-9e1b-9f29a5a48538/24383652672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c524a2f2-586f-49ea-89a0-131da4b69f32/89872893304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abd90253-560a-4869-a2e4-d8c10b891419/dakapoveg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1611a3bc-3b8a-4f33-bda9-4ce1fcc0d331/45432067816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e745a539-c63b-44c4-8852-aae2f9a6373a/jee_main_exam_2016_cut_off_marks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb0aa5d-6c42-4e9b-bf27-0961f2025d4a/medea_by_euripides_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b942fa9-f653-4721-84c0-68197d2999fd/common_core_standards_ela_grade_7_reading_informational_text.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6191c281-a6b2-44ae-aebf-ed215ad68f56/why_throne_of_glass_is_problematic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/247dd948-b985-41d6-9cb3-4b450dc33112/lowrance_mark_4_ice_transducer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06727f7f-a1c5-439f-92f9-1050eacc15d8/nexipamelalolixane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0719820f-481d-495a-bc97-fe5449fd8f01/kisugulifazanosepivuve.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_off00010ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF6 5476 bytes
SHA-256: a2239ef9c2e2b2d14e26cea1cc6a1951066465273ac108b4f8ad09383647f432
font_01_sfnt_off00012187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12187 10256 bytes
SHA-256: 80f7a4d86abd89776f09c7c465a904a725405d1b148be560373c2aa6ad643297

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