Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3fdc3ca0d95609…

MALICIOUS

PDF

73.2 KB Created: 2021-09-20 04:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a080a7f9e7f297440691ab210866a43 SHA-1: d869eabe1dc26490d548998d05f63b9a2bcd61c5 SHA-256: 4c3fdc3ca0d956092a0ade97ce21097469444a29f1b4c4199c2a82b748a3062a
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 disposable domains acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=live+net+tv+bd+apk+download PDF link annotation
    • http://perila-vrn.ru/userfiles/file/6544113616.pdfIn PDF document text
    • http://vaynhe.com/upload/files/73032813419.pdfIn PDF document text
    • https://equinox-e.com/upload/files/kozab.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/97202216204.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/lubari.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/74842798673.pdfIn PDF document text
    • https://digireg.pl/upload/95130526291.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/xuvatirar.pdfIn PDF document text
    • http://domario.ru/userfiles/file/47822036680.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/tobonuxogiluwifagov.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/62742003084.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/fujotemim.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4f40127e81772cbad5f10cf4f0939c45/67472094968.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/zelositaxubifisozuzuvufud.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/31509060595.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/31611519575.pdfIn PDF document text
    • http://apvn.info/userfiles/file/siguxesanusowumenejuraxe.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1dbd3ea5c---93911401923.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/pirexeburive.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/53796401483.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/7387172324.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/zuraxujosalot.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/tifegixez.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/sivosakaxubajowuz.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_off0000bd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0D 10460 bytes
SHA-256: eee0fa854abdead18071bef730c032ce0c51f0315e569ed485c95c811e7cfc80
font_01_sfnt_off0000d4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B9 16548 bytes
SHA-256: 35b57a33f857ee374f8540bae4d9e1e4441c50c035f5149591005755360ec3b0
font_02_sfnt_off0000ff6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1