Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf6a7e8d949a2b3…

MALICIOUS

PDF

143.8 KB Created: 2021-03-22 11:05:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 495edd969301faf661fde1a5130cdcf2 SHA-1: ac9579510b7ef8cc908c0fec17fe044e42493050 SHA-256: 3bf6a7e8d949a2b310ef8dd8b53ae60bff5447bff0e0d1e5a5fdabf9c6c0c783
186 Risk Score

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=what+is+1984+about+summary PDF link annotation
    • http://yewes.space/636208960578ph4e.pdfIn PDF document text
    • http://demask.fun/jezoxubuvogarotoxa1rl.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/0jaFggo/lawumikuwi.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/jhJig65/93975598166.pdfIn PDF document text
    • http://taygerr.com/murray_riding_mower_for_saled85m5.pdfIn PDF document text
    • http://mikrotikwizard.com/nametatonsha.pdfIn PDF document text
    • http://ndfnasg.xyz/mistborn_book_1_free_downloads3w6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_f889d17fdc7d4c03b34f463d75a641ae.pdf?index=trueIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_1359988be873427ea1f03f2e605eec67.pdf?index=trueIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_fd6aeb7fff0d46b995ea4ce022707c70.pdf?index=trueIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_e2ad90cfc6b34f0fa0d8eb2faa74152d.pdf?index=trueIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_7bb23381d0704e798428240e0d2beee8.pdf?index=trueIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_ddff136fe7d348f58c247e4e55e2d245.pdf?index=trueIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_b78acce1db5a4741bea296c4db4b6944.pdf?index=trueIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_727243fd92f24b788ee04f26643518b1.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_5cbd54c1bbfb43b0ac795a01a65af44d.pdf?index=trueIn PDF document text
    • https://bfb79b04-db4d-4c54-a74a-4733ff68ceb9.filesusr.com/ugd/11291b_d00ddc3e2d13466885ff94c24ae99d1f.pdf?index=trueIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_be89b34c09494c49980e361f69894d5e.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_off0001f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F576 5636 bytes
SHA-256: 71dee23ea53040065f45d3c757d8b63a8a3a1ec70d2e1b54714e584d4b27855e
font_01_sfnt_off0002088a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2088A 12684 bytes
SHA-256: 9ccd26fb40695e2c5ea56fc243d76818162add77eee665413192cc0b5a7476e3

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