Malicious PDF — malware analysis report

Static analysis result for SHA-256 441ba4d959cc314b…

MALICIOUS

PDF

152.7 KB Created: 2021-04-01 07:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0e679b3f115f73792a6221753ff6ae0e SHA-1: eca49aaffde6e76d7c706056d28dde4f4d7b4161 SHA-256: 441ba4d959cc314b59498c843ea24eb3061af539e807e629b00d75755ae6ea9d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9958

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 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/award?keyword=boule+de+suif+r%25C3%25A9sum%25C3%25A9+pdf PDF link annotation
    • https://tonofoku.weebly.com/uploads/1/3/4/0/134096462/zatuwobaduxunax.pdfIn PDF document text
    • https://lumikefobebodas.weebly.com/uploads/1/3/4/3/134324067/0fd6c5227105d.pdfIn PDF document text
    • https://vanuvinuvur.weebly.com/uploads/1/3/0/9/130969573/napefaluluwexoki.pdfIn PDF document text
    • https://makonajarozov.weebly.com/uploads/1/3/4/3/134341931/togojevapiru.pdfIn PDF document text
    • https://kagojidumone.weebly.com/uploads/1/3/2/7/132740327/zasosiwi.pdfIn PDF document text
    • https://dozajumeguru.weebly.com/uploads/1/3/1/3/131379069/3216017.pdfIn PDF document text
    • https://fupebabo.weebly.com/uploads/1/3/4/6/134601971/8646710.pdfIn PDF document text
    • https://mifoxafakefan.weebly.com/uploads/1/3/0/9/130969175/6679695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_602eb51a44d8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_6030e4164fcc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501360/normal_601501afa38d5.pdfIn PDF document text
    • http://makilevemifaw.iblogger.org/galaperudupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476272/normal_60362ceaa9bd2.pdfIn PDF document text
    • https://zavowije.weebly.com/uploads/1/3/2/6/132680855/gugupunovufi.pdfIn PDF document text
    • http://pujugekan.iblogger.org/how_to_train_your_dragon_homecoming_watch_netflix.pdfIn PDF document text
    • https://sonikimejikelo.weebly.com/uploads/1/3/2/6/132681145/4448915.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_e2f2361ef499444eb28f16a6d50aecbc.pdf?index=trueIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_77315ef754d84a3dbcc69234f666bc80.pdf?index=trueIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_82d2675f41144428ab89ac575799cfa8.pdf?index=trueIn PDF document text
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_2c3b05d1286b4e229cfdafdf8782d78d.pdf?index=trueIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_72405c733150491dad4ec114ce0263f6.pdf?index=trueIn PDF document text
    • https://318abaa7-a496-4882-a5ef-186b1d719b20.filesusr.com/ugd/ff2e65_1b73b28f70e2476eac30085b5d0d49c9.pdf?index=trueIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_fc3547dc7895433eb1641394283848c8.pdf?index=trueIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_a671352192a3483389c5230b3f5bb7ad.pdf?index=trueIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_be82d8375e0742d2a3383be54264d622.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_8df24337f8cd44d4b86110562f60de0f.pdf?index=trueIn PDF document text
    • http://neloronubu.epizy.com/6022727106.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_off00021ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21ADA 5168 bytes
SHA-256: f1405faa4d7be89275ccdc4c85fae6456c84c83b49f52da83a581593801a7164
font_01_sfnt_off00022c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C18 12508 bytes
SHA-256: b20b19bcb331ad96049c5f091b34abe85202ef53a95c7236e0cb76480bf5244d