Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8e231624a312a9…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 10:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8a1e134c67305f48acb3d604d1f8640 SHA-1: 58a5843d177cf42224d66483cf7216b930f3c981 SHA-256: ac8e231624a312a9ef897dda5725525f27cda81f47a2088397cfb6ea6244fed6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests it is used to facilitate redirection or exploit.

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.
  • 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+make+more+ram+available+on+android PDF link annotation
    • http://pincailight.com/zk/UploadFile/file/2021090902162273499.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/pofib.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/67588188899.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/numimo.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/47074989356.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/tutusogidejusesojog.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qpetcavu6tcqlje0k41aru9rdt/83235602938.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/88239652615.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/kolavisipenejimaxidoba.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/59051425378.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/lunodenadilajud.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/53649357351.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/66596462889.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/zegizavirawoxexejadame.pdfIn PDF document text
    • http://unseretochter.com/images/file/73972271958.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613452046f47a---15007183740.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/mitivetesuwiwisipijemi.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/19389748623.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/84061836600.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/bonogagigopuv.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/51255792700.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109080237506346.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/98221764386.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_off0000d5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 10616 bytes
SHA-256: 3f981b10a965fd2b7400297d1661b7d1bdb0de4828024961d001057daa0d5f05
font_01_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001062d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062D 17376 bytes
SHA-256: 170463298aaa9dfb7c2d3db75afb640d142c66277a670874aff2e39ab87726df

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