Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4dca223710eb842…

MALICIOUS

PDF

68.3 KB Created: 2020-11-20 14:14:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1615ec51095dfebd387973cd5d5ad3f8 SHA-1: 7b2ce35047ae81617640b3a54620b62b22f83fb4 SHA-256: e4dca223710eb842937d274aa423a534632e2f15d3ccf22e4f17b78f0973a63f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, https://trafffi.ru/123?utm_term=how+to+hold+a+candlelight+vigil, is presented as the document's content, likely as a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://trafffi.ru/123?utm_term=how+to+hold+a+candlelight+vigil PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383792/normal_5f8e46a91f06f.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/7304884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367299/normal_5f87878825075.pdfIn PDF document text
    • https://suzixibaru.weebly.com/uploads/1/3/4/7/134709676/zaridamu-bagutovamuvexa.pdfIn PDF document text
    • https://xutetuzaxudekit.weebly.com/uploads/1/3/4/3/134371691/rurafenano_zugebirowep.pdfIn PDF document text
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/maxuvudoxanenej_noxenobiguvodin.pdfIn PDF document text
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/texil.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/2d382550-d1fb-4d73-93e7-ca3377949b1f/vuvufalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4b0edb-6b79-40ee-acfa-9db24eeb4097/7686230029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/545cfcbf-14ca-491c-9bb9-7fe59e4f8f08/55906213328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd04bef4-4545-4531-a24b-ef1d37f38285/j_ai_voulu_planter_un_oranger_parole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d5e6001-00fc-45bb-b606-fe5f660109df/columbian_nun_porn_star.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a63cee-27b0-4333-9c56-2b93f512a964/wimivilitixetarafukazuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e44fa1b-cb04-49b4-9c57-f01927b7bc76/mezirupi.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_off0000d15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15A 5040 bytes
SHA-256: c70998e049bbce512771d5ce7ab82eb758baa04298294d7e86b4190726b25398
font_01_sfnt_off0000e297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 10100 bytes
SHA-256: c2d8efe6d2798208eb4692d118611cfd2067989c14d3ccc91c7f497248f5c6e9

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