Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed8033e1f2bbed6…

MALICIOUS

PDF

77.1 KB Created: 2021-03-16 17:19:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03c0e649b7dc70f8f9e0f094709f323e SHA-1: baca0112c6feb4206ec2c886be7214ddfcb186cb SHA-256: 9ed8033e1f2bbed6fd10a199f0c8ef518f96dce3e3c6e7d192ff62bbfc72358f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external URIs, with one prominent link farm URL, suggests an attempt to redirect users to potentially harmful content. ClamAV also detected this as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=chua+bat+nha+bao+loc
    • https://cdn-cms.f-static.net/uploads/4443619/normal_6041ab8a3f4d8.pdf
    • https://static.s123-cdn-static.com/uploads/4393035/normal_5fe320d5b6218.pdf
    • http://fuvilejolo.iblogger.org/junufidawelodovas.pdf
    • https://static.s123-cdn-static.com/uploads/4373301/normal_5ff2a953a451b.pdf
    • https://cdn-cms.f-static.net/uploads/4382629/normal_603298c532ebe.pdf
    • https://static.s123-cdn-static.com/uploads/4531523/normal_5fe2d4b75c4d6.pdf
    • https://static.s123-cdn-static.com/uploads/4392452/normal_5fe06e8bafae1.pdf
    • https://static.s123-cdn-static.com/uploads/4403804/normal_5fcef82abd024.pdf
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5fe6227303d32.pdf
    • https://static.s123-cdn-static.com/uploads/4427079/normal_5ff9c38d46d4b.pdf
    • https://cdn-cms.f-static.net/uploads/4468294/normal_601d75e3811ca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_5f390e7921fa44f3be2c2551a96d3854.pdf?index=true
    • https://69b12d55-863e-458e-a545-ad358ed6bd1a.filesusr.com/ugd/a9642c_cd03e53ec7624bfa8bd6198a19406ab5.pdf?index=true
    • http://jemekeluvakowop.rf.gd/axis_direct_mobile_app_free.pdf
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_4a14468bf1844690b5c19dc710a8d7ff.pdf?index=true
    • http://bovaxibeloxev.rf.gd/26082212082.pdf
    • https://uploads.strikinglycdn.com/files/319ea9fd-b1a8-4893-a767-aaa62123b6b5/the_outsiders_game_studio_stockholm.pdf
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_aff8572b767e4b4792979b009c45e683.pdf?index=true
    • http://fedatowuka.epizy.com/facebook_dating_app_canada.pdf
    • https://uploads.strikinglycdn.com/files/959d55cc-34f8-4584-81bb-97c9eb016afa/66788858025.pdf
    • http://dadeporofi.epizy.com/3695897828.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b8.bin
1c4ea72b44e396858418d20efbf060aa2e8e78eccc56f3ca3cc9ff23cea89741		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B8 4660 bytes
font_01_sfnt_off0000f488.bin
906daeac5f6f7bedb3ce715cf5b56d89337d222bd0ae3673337e10db6eb19ce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 22796 bytes

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