Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8582b16ad8d4933…

MALICIOUS

PDF

81.2 KB Created: 2021-09-14 11:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e58780bad765a56078ddb872ef41f9d SHA-1: 3b8e50c73c80cc5225668a8e15f0844989cc22cf SHA-256: a8582b16ad8d4933a35eb449c523d401f492d5328b8c534bb9882ba2b3df5ccb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and a high ML score, indicating malicious intent. The presence of numerous external links, many pointing to unknown domains, suggests a phishing or content-luring scheme. The file's structure and the heuristics suggest it may attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://almar-bus.pl/userfiles/file/rapopomofedelivafufop.pdf In PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210905214919.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/70931334247.pdfIn PDF document text
    • http://showdoimovel.com/files/files/45049883481.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/23283531773.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/kugewilitenaruzusurisad.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/wuzuxugarawilek.pdfIn PDF document text
    • http://z500.si/files/59306691588.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/fiwibirovuj.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/54410463539.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/aaesh2mqtsukhu8qgm51eknsmn/80751984061.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/zukikesatukaguxujusumoful.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/sevukolubediwemapipekolo.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/jadimutenolujirorek.pdfIn PDF document text
    • http://centrons.com/uploaded/file/1495879861613c1dffbf6d4.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/pijan.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36007016936.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/99772705773.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/tojet.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/rosagojemet.pdfIn PDF document text
    • http://hidramaco.com/files/files/mokejatoviduzigaguzen.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/didika.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/89012228982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=jadx+to+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_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 18260 bytes
SHA-256: 0f9f38932923f8cb992aa179ec19fa28ea1f2ea8ae78e477c610903489e37385
font_01_sfnt_off00010974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10974 9928 bytes
SHA-256: a810e21221c7d943c1dbfd1547f29d04686855450d85541ec04d58ad9ba834e4
font_02_sfnt_off00011f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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