Malicious PDF — malware analysis report

Static analysis result for SHA-256 20092c284aecc00b…

MALICIOUS

PDF

85.5 KB Created: 2021-03-17 16:53:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 09171f649f712c013e4409db04c0881d SHA-1: b3e4b024c35ee6b36161ef9bb57945fb08511869 SHA-256: 20092c284aecc00b1c7a38511f08b792a35f9d8e89b9808c4a900f1738eb57a0
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a large number of external links, many of which appear to be part of a link farm designed to deceive search engines. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a browser extension or update, a common social engineering tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest it is designed to redirect users to malicious sites or initiate further malicious downloads, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/award?keyword=adobe+after+effects+cc+2020+tutorials+for+beginners+pdf PDF link annotation
    • https://libigidibejaxa.weebly.com/uploads/1/3/3/9/133997225/c02ff19872a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487897/normal_5fcb2c123dc90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386354/normal_60100124e544b.pdfIn PDF document text
    • https://febufovita.weebly.com/uploads/1/3/4/3/134324671/lomazexetetod-buwavusa-vejasewadoneket.pdfIn PDF document text
    • https://wewejodoje.weebly.com/uploads/1/3/4/6/134685686/novizawegeguv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467927/normal_5fd32f45669af.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/69bd0f38-52c0-4986-b356-b9f680f06e9f/vishnu_sahasranamam_lyrics_in_sanskrit_mp3_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be32bc47-736d-466d-84c0-2b8772509e75/68041403669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc86174d-e8ae-4381-9993-39118349b1d7/curtis_sno-pro_3000_snow_plow_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ede6acc-8fd4-4e97-acf6-a30960989dbd/20142026792.pdfIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_34033cdb444f426eaa3c472271aa6b4b.pdf?index=trueIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_160436b930af4c3190037e339dadeeeb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c10f9c71-a13c-4da9-9af7-d169a13aa1dc/duzitiwuniz.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_0c3a4636d341451da5aeb397f6a3ed30.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82c29fe7-403a-487d-942c-ba045edd95fb/second_language_acquisition_theories_timeline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e511c123-b166-4698-a013-c5be7e94917f/defixobowufibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0743bae4-9df2-424d-bb48-e1a5023333fa/black_and_decker_toaster_oven_instructions.pdfIn PDF document text
    • https://0c43c058-97b3-435a-b041-a9f001bfa883.filesusr.com/ugd/791d74_248bec63e77546d6b302fe726965c5f0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c9921c5-e6c0-4e82-a37b-cf190c34f706/how_much_do_graphic_designers_charge.pdfIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_a568dd25d3434b858db5c36a29299156.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd762ec-0c09-49fd-b2b4-20da07da71b6/fowakebiz.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_off00010d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D78 5728 bytes
SHA-256: 5bb40454a21db481b31cfefa1f7a948e367034462f34ba6b8d5a9b1e753dfa0e
font_01_sfnt_off00012107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12107 11076 bytes
SHA-256: da05fd6906ca74df659ec1d5ff20a35fb71913d06d779e37bbc3c01c5d22dd01

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