Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a5f44c95bee05d…

MALICIOUS

PDF

74.7 KB Created: 2021-03-14 09:05:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c744b6fe98457639d40460362e6c623e SHA-1: 5550adf2051eba552bbc9948d8a74b7a4556e900 SHA-256: 73a5f44c95bee05d8990498d2aaf0a5b6214b16a89d90e357f506e5e98b28e54
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://seumenha.ru/wix?keyword=geometry+area+%2528apothem%2529+worksheet+answers', is likely part of this scheme. While no scripts were explicitly extracted, the PDF structure and the nature of the links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/wix?keyword=geometry+area+%2528apothem%2529+worksheet+answers PDF link annotation
    • http://uspehdnyaaxyz.xyz/29240434380xze8a.pdfIn PDF document text
    • https://cdn.sqhk.co/lizasizova/jcUgg47/vavawidujusetom.pdfIn PDF document text
    • https://cdn.sqhk.co/rizikodeni/hcQgujb/lemagiredokukolazeguduto.pdfIn PDF document text
    • http://larebipi.iblogger.org/71389131382.pdfIn PDF document text
    • https://cdn.sqhk.co/kisoxukapab/geaWieG/xbox_series_x.pdfIn PDF document text
    • http://opt15.ru/xariteledik0klv4.pdfIn PDF document text
    • https://cdn.sqhk.co/revipidamog/ahfgggj/my_talking_dog_2_virtual_pet.pdfIn PDF document text
    • https://cdn.sqhk.co/puninuzono/jheRtGK/toxomasavasavelesomu.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/94f6b7a0-2d4d-485c-bd32-1d25c6c34be5/los_protocolos_de_los_sabios_de_sion_libro.pdfIn PDF document text
    • http://ruzoguniwu.epizy.com/terubukizoruxom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/501e37ea-5907-4bb2-b3a2-cc9a5f72599a/52992959507.pdfIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_c6e50d3ca2c444bd833d2be11fe83270.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f2eb60-a9ed-4417-b60e-b7f4e9faa100/88304869050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04306681-e6fd-4a75-a5bc-e22a77ed9248/10_major_bodies_of_water_in_canada.pdfIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_542cc2c00cd7465f8c18a3ab63724757.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74f3a2c6-ec17-4610-b20f-aaaaee68142f/84475936912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e88d4aa9-10bc-4aa0-9ec2-6fc69e2f6119/25704648929.pdfIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_cec81c51ffc84bc5a2934cea62c591df.pdf?index=trueIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_f5aa5ec1ff9e44ca98cf55265b3c7594.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eeac50d-10ba-4910-a2c4-8c6af6e37dd3/migowe.pdfIn PDF document text
    • http://tifatorebuvu.epizy.com/duwazugiwaberekobolupub.pdfIn PDF document text
    • https://827a6da4-a69c-4806-aaaa-db522494bc4d.filesusr.com/ugd/cb5916_2831e96bca2b4899a5572b29f0edcf10.pdf?index=trueIn PDF document text
    • http://todetizos.epizy.com/how_to_use_oil_for_cradle_cap.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_off0000e6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DE 5468 bytes
SHA-256: aa2c679b2ac3f78795dfe0a122b22f0d6c3087548acd84a5c06ae0a36aa7152a
font_01_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 10528 bytes
SHA-256: 0df2cc71de8fe3937a5c2d0e41a4bd90bae1d5f498638a569602bee9ebc1f2e5