Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a76b18072859bd6…

MALICIOUS

PDF

74.3 KB Created: 2021-09-14 13:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 589e6572e6dd5486297e86fac375331b SHA-1: fd7894933acb31f5203c1d3b62988b3a6e397dd2 SHA-256: 1a76b18072859bd606a3ea8ae2049076f78b00fbc471729fbe2454d413b26501
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by an ML classifier as malicious and contains numerous embedded links, many pointing to disposable domains, suggesting a link farm designed to host or redirect to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. While no scripts were explicitly extracted, the structure and heuristics indicate a high likelihood of the document serving as a delivery mechanism for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://recit-de-vie.fr/userfiles/file/dujototupaginizofovigep.pdf In PDF document text
    • https://webmakler.org/userfiles/file/mibop.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/97928528627.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df7b77e8ac---39302877782.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109101152379621.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/97605790648.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613418f2a701f---lawuduxan.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/sixupazurog.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/22998493691.pdfIn PDF document text
    • http://njxinbell.com/upload/files/14864233141.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/91667073488.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/70454733006.pdfIn PDF document text
    • https://autoskola-scp.com/files/77631513246.pdfIn PDF document text
    • http://landia-print.com/pdir/file/vimomeroweniwulewotokimuw.pdfIn PDF document text
    • http://bushurov.ru/images/files/xezizokapuxemavula.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/kijaneg.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/lapuweza.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210903235703.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/98652588945.pdfIn PDF document text
    • https://cityface.cz/res/file/pumokox.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/50685502994.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/guzug.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/67355539163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=free+android+data+recovery+software+without+rootPDF 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_off0000bf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF86 16844 bytes
SHA-256: 24399db3fe817805881f61500e2a8cd305b11f726e9cc2901a6b11439fc55f80
font_01_sfnt_off0000ea66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 10868 bytes
SHA-256: e3289f8ee16d447292dd6ec70187c3c3d699bdc799d8dc481d49a87fa4b4631d