Malicious PDF — malware analysis report

Static analysis result for SHA-256 677a547fe2e9829a…

MALICIOUS

PDF

72.7 KB Created: 2021-03-24 21:57:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1f0ee9088022a4da7db6dc71ecd7518c SHA-1: 82a5d36dc8b4f9a86b61f185e836c2957411e9ed SHA-256: 677a547fe2e9829a05055fca4e23163757ffbe1946b2b30f8ba9fd4de7339aa5
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://pelibifir.ru/wix?keyword=what+are+the+characteristics+of+plants+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382407/normal_5ff5a17ce00d6.pdfIn PDF document text
    • https://cdn.sqhk.co/natokaze/djhRgjm/4818447642.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/icieUnl/59738164412.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/pokemon_let_s_go_eevee_nature_guidewyjms.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_5fda84f860bfc.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/ggwgjgi/ping_pong_3d_table_tennis_net.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403276/normal_5fe3b809d462b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426941/normal_5fce2f249cb47.pdfIn PDF document text
    • http://soul-felt.com/3059163337yx9oc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_867d76d58bb745f39580cb222817f942.pdf?index=trueIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_29ba713864c3467b832c79e3b2aefe5a.pdf?index=trueIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_21d4d51a90534692a305d0e740aad2a6.pdf?index=trueIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_1f93ae23136d45a2b214a83be3846abc.pdf?index=trueIn PDF document text
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_d2810ca20aa848369bcd0ef739d4c54d.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_4479168c078848b19f20d917572f49f2.pdf?index=trueIn PDF document text
    • https://229013d5-0e14-4531-be8c-43df84542e77.filesusr.com/ugd/e4a895_f2bb021f56cf4069a8d6c082988c4d0c.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_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 5272 bytes
SHA-256: eb2bfc0dd577924b4585d1084971bf9cbe6d4c480c6ece34c595148c1ff5854b
font_01_sfnt_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 10064 bytes
SHA-256: f4d189d8a0923804316cd4bfc66072591d87dcf5acedb941f3fed22fe381c051

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