Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4e2bcaec24046b…

MALICIOUS

PDF

71.3 KB Created: 2021-09-17 13:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: affa501967f458d93a68fe6deef53b62 SHA-1: 4adfff8419dd170f9618d4b9475d78930ecc4646 SHA-256: 4a4e2bcaec24046b1b8bdbfa520b3ab0c80ac303b9fb1b8d442587d30666ad20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://rtquery.reitoken.org/Coaching123/images/files/bomomegewax.pdf
    • http://fitviewer.com/files/file/gulesapaxudexojemukikuwuz.pdf
    • https://il-gusto.com/images/file/20446881216.pdf
    • http://zbraneklapka.cz/ckfinder/userfiles/files/saxavol.pdf
    • http://adveotec.com/img/file/roredupozar.pdf
    • http://eikenhorstgroep.nl/userfiles/file/mojodimovatewutuj.pdf
    • http://montazerangroup.com/uploader/file/vujawaxukuravugale.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613049a34dfbb---76108260392.pdf
    • http://watdoenwevandaag.nl/upload/vapanot.pdf
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/29643431961.pdf
    • https://festival-bg.com/media/ckuploads/files/56684091418.pdf
    • http://simsvizag.com/admin/uploadedfiles/file///42928687920.pdf
    • https://kominove-centrum.cz/media/files/file/jijifaguzijezenasezap.pdf
    • http://box8websites.com/ckfinder/userfiles/files/64004738999.pdf
    • http://moskvaznaet.ru/upload/files/ropafidu.pdf
    • http://grimastone.ru/files/biwebowuxuxerufuvibawavab.pdf
    • https://tebra.si/userfiles/file/40884404450.pdf
    • http://shriramashramps.org/userfiles/file/99253028089.pdf
    • http://gt-outillages.fr/ressource/site-image/files/90844488047.pdf
    • https://vnsteeldetailing.com/UserFiles/files/58865387915.pdf
    • http://divyabodhanam.org/userfiles/file/xokisuwaraz.pdf
    • https://pasarant0g3l-turbo-h1t.com/contents/files/99152563988.pdf
    • https://desco.scp.hr/files/46444343509.pdf
    • http://gyarmatilovastorna.hu/userfiles/file/60257001708.pdf
    • http://herium.net/FileData/ckfinder/files/20210911_93791E633B5F4E18.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=korean+pronouns+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6f5.bin
e1275062b9192b072da3c8c1fde09ad770aee3e6321e870c36428bd090e20a8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F5 10344 bytes
font_01_sfnt_off0000ce63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE63 16792 bytes
font_02_sfnt_off0000e675.bin
ed123d1eddce73157797698d1a7ce464801886465ceb981214adcfbca27c0828		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 16120 bytes

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