Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb8e6901340fafd…

MALICIOUS

PDF

85.4 KB Created: 2021-09-23 22:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 274488effcc0d36caea9b44335399a8d SHA-1: d47435959db27879f8a0bee1eae39a07d12efd1c SHA-256: 8fb8e6901340fafd6187f870753030b87fe92c64ebbe8e2d2d56bcc352cc5d41
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

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 an attempt to execute code, potentially to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=bus+simulator+2015+free+download PDF link annotation
    • https://petribax.com/userfiles/file/lejalameforaduwerozogof.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/40763752950.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/vovimujibirozajonilum.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/gogaloxonerepodewo.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/57597396311.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/nojuvutalasovafiwojufiwod.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/suvoz.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/dolerawamoduwazumitot.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/73021985279.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be24b5060e---tiwagisobabodilut.pdfIn PDF document text
    • https://papiratisk.cz/soubory/kudinopulaxe.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/62781764109.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/64419500039.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/wutarekivigujogikekofikiv.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vikilepivazunixebibu.pdfIn PDF document text
    • http://dsraxys.com/uploads/botevanefewebomimaxud.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/84612884013.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/5d2318b8d280cb44375026f5adfc9cc3/tukesubovapoduxemaxeso.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/28538508725.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/53807592823.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/xemulej.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/siropowe.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109130332315953.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/11330364267.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_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 11180 bytes
SHA-256: f23885abacc9264dce6ba91ef33508ee7bf10c3cd7ac935cea4ab458e4a68794
font_01_sfnt_off000102de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 17176 bytes
SHA-256: acc43d84af54367f79227f25c5eee1c1b0a1baf1e4bb2699330f60ab95ff5444
font_02_sfnt_off00012f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1