Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b88eb1b7daa0eb…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 02:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c3dbe67d817b20841cc5054fef83631 SHA-1: 27ebbba18f34876e64ba53b297e286828b4b1280 SHA-256: 67b88eb1b7daa0eb13ae882e7be837bb817d2601b3f9cc691102451e4012c664
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with one prominent external URI pointing to a URL that appears to be a lure for downloading a game hack. The presence of a 'download button' heuristic further supports the phishing lure attack pattern.

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 https://garglob.ru/uplcv?utm_term=gangstar+vegas+hack+ios+2020+download PDF link annotation
    • https://georeno.ca/userfiles/files/maminidumojanewid.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/fobofisirofu.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/fijatugixuxofexed.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/vezogetiviwewedojadusu.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/belizesot.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/givip.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/08b3d1e34f07dde4f0178fab3c00f01e/7067445723.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/75138037493.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/68644612749.pdfIn PDF document text
    • https://profesa.net/userFilesfile/xiviniwomomubovewas.pdfIn PDF document text
    • https://longhoang.vn/upload/files/zotome.pdfIn PDF document text
    • http://www.puhito.hu/uploads/ropufeneromerinoxol.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/77885362607.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///xapodekisoferizo.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/nuzazupulekedisazo.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/gumogupubuzonapuxo.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/53018424475.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16311417317604.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/36595341969.pdfIn PDF document text
    • http://etre-belle.su/images/file/35907286754.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/35094686598.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/balipekikulami.pdfIn PDF document text
    • http://zae.me/datafiles/file/sopago.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_off0000d5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C9 11172 bytes
SHA-256: 4a870dd26f92f98d16e3050128cfd3577dd3af64f98cdecdba58573133416a16
font_01_sfnt_off0000efd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 17836 bytes
SHA-256: 3b3b3d4afe62379f79ec5d57d8ad6e538bc2ee28a1b536561cc449b65bd14178

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