Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcb816c3797080b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 22:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2cf2f9f1d42c2530084cc31c6ce422d3 SHA-1: 795ff6c3050834bb9c50a416aad6075d9b2921a4 SHA-256: dbcb816c3797080b593f5270df233428883aad66728432ba835ad2e620951e72
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=how+to+use+datepicker+in+android+studio PDF link annotation
    • http://s2ipower.com/survey/userfiles/files/mijudunikomifozabe.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc666220c---nuzokota.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/fukalujujepejenidobep.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/55954569489.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/37617771431.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/dikovisod.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/savodizeluveninabit.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/29714749513.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/18391290340.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/ginev.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/zozorujuvagome.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210923080430.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/89137272677.pdfIn PDF document text
    • http://effekt-film.de/files/file/40611594239.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/38960761035.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/fiwapog.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/vorovepelovibegebevifu.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/10671116348.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/welikuwizojivujotepijimi.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/40714617584.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/65301400239.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147449f3bf18---16845121131.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/49336320982.pdfIn PDF document text
    • http://clingac.es/d/files/61597093725.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_off0000af6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC781 10728 bytes
SHA-256: 99c1b6c327ef31725f9db4e7bb72d1be52bdd17e3b89ef787399892f15051edd
font_02_sfnt_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 16600 bytes
SHA-256: 54504a6bd739f60d1faadfc281a9a162ed9f76d58e819245a02b4c5d789f9455

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