Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3708b6faed3f974…

MALICIOUS

PDF

74.3 KB Created: 2021-09-15 21:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7591ba3ae5fac429f1bd6da808d5e6d8 SHA-1: 61e4bd0c2985650b8fad446be3b5dd70128e17c3 SHA-256: a3708b6faed3f9746c9124d140330dd6fb2c1c9937ee0e9e625db74472e95355
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to 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 presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

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://chachachat.info/js/ckfinder/userfiles/files/40852821278.pdf In PDF document text
    • https://e-midas.ro/files/file/favezufalixesovew.pdfIn PDF document text
    • http://cochemical.com/upload/files/95387976826.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/58169461933.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/48965976746.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/pudigew.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/8576025902.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/90031022620.pdfIn PDF document text
    • http://gdgom.com/upload/file/2109022117267428277xmwsp5twog2.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210915164225.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/11513918515.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/94360572213.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/dofudikizififekowobax.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/37696912963.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/tejodivezunowe.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/97011677088.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613705cc4ca6f---55491056834.pdfIn PDF document text
    • https://ancoraeducacion.com/images/wipowusuwopof.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/gaxenimozumuvebaxasasavov.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/difisorudabodot.pdfIn PDF document text
    • http://cascad-trans.ru/files/ledajisu.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/zetosafo.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210904144843.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/zixuzigonifafajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=harry+potter+and+the+order+of+the+phoenix+movie+onlinePDF link annotation
    • 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_off0000bcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC7 17464 bytes
SHA-256: 2d3182e6f8c9dd11491cca77355715edef15f6c5b9914501b8fa912585cca025
font_01_sfnt_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 10868 bytes
SHA-256: 7f9fb628c83d86c464c3171be69e17e8fc2039506cbbcbc40559b3f55118ce16
font_02_sfnt_off00010312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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