Malicious PDF — malware analysis report

Static analysis result for SHA-256 590896e9b580b304…

MALICIOUS

PDF

76.1 KB Created: 2021-03-20 00:23:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 80f188b5c8251413c50e31ef244393ea SHA-1: 8cfa1afd4e47776465920c3afdb3d1e107244886 SHA-256: 590896e9b580b30422a695931d43bfd1ff32794e0e9dbae457e6e7fef87b0dfb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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/wix?keyword=the+ffa+emblem+word+search+answers PDF link annotation
    • https://nunofisodopuw.weebly.com/uploads/1/3/4/2/134234763/rawizotibuni_rogemex_kibotojejam.pdfIn PDF document text
    • https://nutagabe.weebly.com/uploads/1/3/5/3/135325028/buwumutevolirupupazu.pdfIn PDF document text
    • http://lakegefufen.scienceontheweb.net/99868081657.pdfIn PDF document text
    • http://trysoda.club/wetodvhhn1.pdfIn PDF document text
    • http://wersita.space/messenger_ios_free4yte3.pdfIn PDF document text
    • https://butebipibib.weebly.com/uploads/1/3/4/2/134265815/5936576.pdfIn PDF document text
    • https://zinimokukaz.weebly.com/uploads/1/3/6/0/136053997/250038.pdfIn PDF document text
    • http://look-hotel.com/nolutubewilrv2e3.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/08ea8cb1-d5e8-406a-b9f6-399598cf8243/dijipomisasidozuf.pdfIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_342b3673e502430898a6be37ea31ee46.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb086003-081e-48a1-8fe4-eed9987607b2/mogawowisetuwijodal.pdfIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_c6880e800c694a00aff33d50e504e78c.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_b9e3154f19684394939d2b4e0c4cd50b.pdf?index=trueIn PDF document text
    • http://zesafemumibow.myartsonline.com/likoba.pdfIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_e2cac5fde2de4a508b15b7b73eaf2215.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/348580e5-9e01-47f4-816b-1ceb23184f04/what_is_the_best_breathing_technique_in_ro_slayer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99aa57fc-3340-44c6-ad14-f7d33f284347/rapunilelorutotivaju.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_751711cb0aea440c98208671c6083799.pdf?index=trueIn PDF document text
    • http://somasetowijo.myartsonline.com/64985840410.pdfIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_d0ccad529743484eb1f21e0c204f0ff5.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_off0000eb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 5440 bytes
SHA-256: 7c356aa62f9fe03cb33e07b6fbb01c7133193916cec8ec6768bcba87864cbdc6
font_01_sfnt_off0000fdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 10916 bytes
SHA-256: 80c0021ea6662c96199cc409eadeaa7b60c93e448d6e19cf85bc76daac910a88

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