Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a9c67bd5218dbb…

MALICIOUS

PDF

76.1 KB Created: 2021-03-07 08:49:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1da58e9a37c72bd21b1724434459cb85 SHA-1: 5f840bf09917739fc323f0cecea7ae8f02cd04a3 SHA-256: 56a9c67bd5218dbbdd000e09e64f5d4297a3fe3c0027bc2b338c5ccfcc0bf25a
186 Risk Score

Malware Insights

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

This PDF document, generated by wkhtmltopdf, contains a lure for "free robux group funds" and exhibits characteristics of a link farm with numerous external URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/wix?keyword=free+robux+group+funds PDF link annotation
    • http://899themes-demo.ru/pekaximebuvu7r21.pdfIn PDF document text
    • http://mexicotop3.xyz/wulimurisus3ez5j.pdfIn PDF document text
    • http://save50.pro/accessing_the_dark_web_on_androidao2ip.pdfIn PDF document text
    • http://worldworkbook.com/kosaxovironibinuzuramerilp4w90.pdfIn PDF document text
    • http://1xbet-football.fun/6411474872swdh8.pdfIn PDF document text
    • http://apkweb.net/69634658341gso5z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_30ff5582be324bf49287ce7240c0cb22.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/dedugi.pdfIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_df6cf75dec3244d081413e3c709ab3cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4287f552-0fd7-4e91-a60f-44526f5308da/uppababy_car_seat_install_latch.pdfIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_66de23bcd00e4c1aa2fb1a4ea0c0bbfa.pdf?index=trueIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_3d11b76af74241009789af15d0015369.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feliso/3_estates_of_government.pdfIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_6fdca4b4478245128af555e4b10ecd42.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_ccb06b8d95b644b08d3dee9be212efbf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/how_to_install_electrical_switch_for_garbage_disposal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5eb3cc6-093c-4a10-b0df-3e8c90cf849a/23382393380.pdfIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_bccb76d1d11b41e8a40d7c647de26197.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ab227d9-a480-4dcd-a59b-d9bca6da5be1/regonedixipozuwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1774d60-c9e4-4c95-add7-f66813da068c/79797095609.pdfIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_d409f16e84df4f6b86100948c9cadaa9.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E7 5132 bytes
SHA-256: cc4186b3dd63c1b207f413ce9f38df83917767f175c28319ac8c916527c89a55
font_01_sfnt_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 10452 bytes
SHA-256: 8448aa6a60e1c1ed6d5a15f6fcceade34acefca7d2995293d1dc37a545d7a5dd
font_02_sfnt_off00010df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF6 16148 bytes
SHA-256: 64f21e55c2f29c6f605e8f9fd96e7f7b34f9b4a26fdc717ddead948457370e3b

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