Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e0fe08320e3860…

MALICIOUS

PDF

78.2 KB Created: 2021-09-24 12:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba7bd40cb20ced79b2a7b981848ffa9d SHA-1: 737817670c118ab96570d9178493b404a4d9f89e SHA-256: 83e0fe08320e38602813e3b5f6746d38f635ed70f3d63f4c0c723bd383ac1094
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the interpretation that the document is designed to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://ku4ysk-9lgp4y.com/contents/files/25456657682.pdf In PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142dd95d2739---72315900918.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/gitupofozabazemavopitup.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/34967036674.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/rixuwut.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/96673723476.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/fuwanelubibebugalo.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/38218463780.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/53335496470.pdfIn PDF document text
    • https://aksusu.com/upload/files/44636160783.pdfIn PDF document text
    • http://scsychem.com/upload/files/fabap.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0c42a45ea---sijimuxisivox.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/53782829573.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/81947158853.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/53885612019.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/36589471682.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/40786268875.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/nawadura.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/72267560291.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/96591612799.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/92c9fa0e7ca3349f2e30347752df13a1.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/8928818656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=miui+12+live+wallpaper+apkPDF 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_off0000cf2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2A 17196 bytes
SHA-256: a85b7ca3b9fc63a601d47866e865df296911c358c7546021bb3bab7bd745cb38
font_01_sfnt_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 10264 bytes
SHA-256: 892f47657d185985e93083fd7c54d63d125d043f7415f2813e9ce0f8c141a4c3
font_02_sfnt_off0001130c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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