Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efd72eeb5c7ffb6…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 01:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d17d55d7c7d5183bda5e0f5e2a7a793 SHA-1: b773005e01336a9c1aa89114717ac7cb9c0908fd SHA-256: 8efd72eeb5c7ffb60d12526a3f3ea2b2cb2be5964a1bf5785341943352be6d3f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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 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://chcial.ru/uplcv?utm_term=masaje+deportivo+pdf PDF link annotation
    • https://santechnikosdarbai.lt/images/files/31507909047.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/tigisapawofifabined.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/24929270480.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ude8em00ur974ehdsm4qiemesm/33238911343.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/zopupupukakega.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/nirumumojuvinulofukowuvu.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/98956502410.pdfIn PDF document text
    • http://raczcsalad.hu/files/91944584630.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/45772586850.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/44860889284.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/vuvelen.pdfIn PDF document text
    • http://kant21.com/userData/board/file/fabisapejakusurajaj.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/tulufemudatabasolepivak.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/36172650453.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/texepobilupufekub.pdfIn PDF document text
    • http://zimmerei-possert.at/tezuwapugaziziluvu.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/zaselulo.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/28893912521.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/tedawo.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///15267955375.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/lolizejozomarijelofus.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/49610064054.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/17781570408.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://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_off0000b5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB5 16640 bytes
SHA-256: 36d7a7781af0c2dce493f4cf7a09dee389ee71ca7bd42573cf7569d94741e049
font_02_sfnt_off0000f7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 10528 bytes
SHA-256: fef84f0c82f68b7fa3224645b4b2eae859fce02db61f44cbc57962b33e33a241

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