Malicious PDF — malware analysis report

Static analysis result for SHA-256 29308924aaef05b4…

MALICIOUS

PDF

72.6 KB Created: 2021-09-23 22:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fff1b2017a392280881c587dc3588683 SHA-1: a2f63166f4af88a67670ee17c58d330cdcb6bb63 SHA-256: 29308924aaef05b4d2f3ca504b7bd2ae262021e3ccaf1109836f7ddeeec81849
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further payloads or visiting malicious sites under the guise of providing a free PDF download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=color+atlas+of+biochemistry+3rd+edition+pdf+free+download PDF link annotation
    • http://tavio.su/files/file/xanuvufam.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/22282106173.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/23804399180.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/bavokezabewuwikefoja.pdfIn PDF document text
    • http://thongthien.vn/upload/files/vavofusatemumekufixix.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/pimomum.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/libezelalesedex.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/39651690285.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/fozuravataxego.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/valokofotoko.pdfIn PDF document text
    • http://talesma.com/E/file/nafopudoluzos.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/1532984a9f1ba51b8d3a023a1664ac1b/wusesopojiraloferikuk.pdfIn PDF document text
    • https://signika.pl/Upload/file/zupusonagopelumu.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/bopifazugilip.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/felarit.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/11405688039.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/xenibubejijasenakunuki.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/kowasigumukoxibada.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/63338457083.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/82297138560.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_off0000b6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A0 11428 bytes
SHA-256: f7e4be4bd0efbafdb33e747c98422353c558784cc52e2ca77dbc01262438200b
font_01_sfnt_off0000d152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD152 16256 bytes
SHA-256: e9ca1113d61ba48a00f373db5104f8413a0a07bb07c39d05ef38a94b8de110a4
font_02_sfnt_off0000fa3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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