Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5a6b6976be4a0f…

MALICIOUS

PDF

72.8 KB Created: 2020-12-16 08:01:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: feb2e178734318090ac880ac5498dc8a SHA-1: 9010cd470b55d3ae834dc8b945055c359ae5d1cd SHA-256: dc5a6b6976be4a0f9f77023deebcd6567e13b9c58cbf218f80c46bdefe31e18b
136 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on Weebly and other platforms. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting an attempt to distribute malicious content or engage in SEO manipulation. While some linked PDFs are confirmed benign, the presence of numerous unknown URLs and the ML classifier's high confidence score indicate malicious intent. The 'SE_REMOTE_SUPPORT_LURE' heuristic suggests a pretext for further compromise, though no specific remote support tool was explicitly mentioned in the extracted document body.

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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://traffine.ru/strik?utm_term=o+sole+mio+lyrics+translation PDF link annotation
    • https://nobujowufovipi.weebly.com/uploads/1/3/4/6/134636268/gafowojasil-jomezomu-tegemonipatidax-xotit.pdfIn PDF document text
    • https://woxawilafuzuve.weebly.com/uploads/1/3/4/6/134669094/katelorim-vuludus-josovew-fulofewax.pdfIn PDF document text
    • https://miwilokak.weebly.com/uploads/1/3/4/3/134375457/nopozudevaduvuxim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc2a60b1c8c7413143d24fc/t/5fc98aedcf87d0256fe41998/1607043822373/conspiracy_movie_2001_summary.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6c9ba43c5ee75bf27f545/t/5fca34103ff94c207e1345c0/1607087121055/fighting_star_japan.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc549e8c6d96458363f0fae/t/5fcb1be79cf56e0e8b0c4698/1607146471576/wawezafosutaj.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/bag_s_groove_sheet_music.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56cb79955c744b559bb78/t/5fcfb9ec1a78ee5f01754d3b/1607449069118/85554922261.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc390e0f9866f3fd2e4e56d/t/5fd14c9e8b8f1325fcb3ef92/1607552159273/polovotujokonadopuguzoduk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b955be9b6939512bdb09/t/5fcf5eb769d6d06d553f729d/1607425726084/64917748564.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/guide_d_installation_fibre.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/suzefilufefaxu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc18365f9866f3fd2d8aaf8/t/5fceaac3e985de2631fdebb2/1607379653794/gedewevipibex.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B5 3120 bytes
SHA-256: fc8525cffc5dc8802206c2c3d2889378c9071e58e2a7d596030ec1c308a7f748
font_01_sfnt_off0000dde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE9 5072 bytes
SHA-256: d57cefadd10aa19d57ba6c8fe29366986d72fad32200a5efcf07d5a2b1a22ef8
font_02_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 11972 bytes
SHA-256: 0a1fbf38e774d455de986a35e30f77f9110364e60460a138fbb08846affc7e9e

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