Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4d0633655091d0…

MALICIOUS

PDF

84.3 KB Created: 2021-05-12 20:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: aaafd05952ad053fc45fa511196b9956 SHA-1: b6892c9964ae2d9af68ea7d9c1eb5369da2fbd90 SHA-256: eb4d0633655091d04f028cf06f32c9f32ce98692224ed2244e354464660717c7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm or SEO spam operation. The primary external URL identified is https://leonvi.ru/strik?utm_term=navy+rugby+2020+schedule, which is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/strik?utm_term=navy+rugby+2020+schedule PDF link annotation
    • https://wemowojek.weebly.com/uploads/1/3/5/9/135993501/dafemexotijoxogi.pdfIn PDF document text
    • https://zofiludel.weebly.com/uploads/1/3/5/3/135347527/bonanifiwazeseb.pdfIn PDF document text
    • https://penonogam.weebly.com/uploads/1/3/4/0/134012545/dasarikijuvuxow.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/6b5d1414-2210-4359-bf64-c68240a02430/77446328225.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_9decaf8c5b3346c5b247cb8da3411b14.pdf?index=trueIn PDF document text
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_1868649cecfa45cd8ca5480861c95326.pdf?index=trueIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_09e7335680c04956aee4920889f9ad3e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11e86e5-bae1-43aa-8600-a4a8e136d0d0/28941445756.pdfIn PDF document text
    • https://a1b876fd-e98f-4594-996d-fc523792ae9e.filesusr.com/ugd/efcbf0_f4a6e85be2eb41dfb3b3beab26de04bf.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_1fe83a0175d3492193a2b7b24f9d0dd2.pdf?index=trueIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_9ecdd098cb574ac2b6dc85b68becde30.pdf?index=trueIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_bbd18736ec6e445aaafc0fc1ce944445.pdf?index=trueIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_9438d7d14edb4e47a2b28b3ed5917773.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_79a2e83e9cca4895924b76192a42fd49.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e04a9946-690f-43fa-9323-245e9ae9821b/8102384786.pdfIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_5a001be0813646b6b92094cad4c851f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8612d2c-c8b6-4bc1-9761-1bdde02f757a/graco_3_in_1_car_seat_safety_rating.pdfIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_709c9bd09bbf4d3b8d86b8d80734ee1e.pdf?index=trueIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_54810c72b93b439894ad9ab06f351775.pdf?index=trueIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_6c71c9d1878446b1a17ff68d602d7733.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d55f308-cda4-4a36-ba30-8694746c8c2a/94755708950.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_6f1314e0138d411585b06ed31bea63fd.pdf?index=trueIn PDF document text
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_53867f55cb9846e6ba194f11841785fa.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_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 5744 bytes
SHA-256: 96c75e969ab008acb1a396912cad342553db7cb5169bb73e17c25778f2234742
font_01_sfnt_off00011d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1C 10960 bytes
SHA-256: 2a26a920fd8d7c3c644fb0ebb406d0178534e796f22195aae5c41da581b42be3

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