Malicious PDF — malware analysis report

Static analysis result for SHA-256 9025eb020a332d06…

MALICIOUS

PDF

71.9 KB Created: 2021-09-14 07:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 516204020111cb3a9b429fef74752fbe SHA-1: aa9700797344c3f84093359bb93ab2e0714338bf SHA-256: 9025eb020a332d06d7d272d9c7ca8034ad9b0777a493501eac7d805b5c939fad
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high number of embedded URLs, many of which point to disposable domains, indicating a link farm or spam campaign. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 4

  • 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://mvpartners.be/images/uploadedimages/file/vewopajesaduji.pdf In PDF document text
    • http://proallprint.com/userfiles/files/jidujenopilanuxobu.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/zolubifi.pdfIn PDF document text
    • http://ipublicity.cz/data/file/biwanovusebawatulu.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/dokokasatapejadeveremesim.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/novineloborexe.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/1435514995.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/10217850478.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/22197517376.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/95116298676.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210901102255.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/46351601707.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/61678799613f8e7240a90.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/lizonakizinosofumobapoda.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/55169119070.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/80748143791.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/35283482586.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/mazavoxiv.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/xilimix.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/75314310884.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/94019754163.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/84498985526.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/76199168827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=wapking+mp3+songs+a+to+zPDF link annotation
    • 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://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_off0000b817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02E 10632 bytes
SHA-256: d81e900b6474afa7cb5a309cf80662041ee845d32a7f8855d9ece7f5a67d41cf
font_02_sfnt_off0000e899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE899 16128 bytes
SHA-256: 2f78a466ccb3d11f1b6a4633a192f11632883d66bc2293f9e7540ec50613035d

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