Malicious PDF — malware analysis report

Static analysis result for SHA-256 315cf624afc6a056…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 23:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7b0fa516988b21c545071d8c3de1f13a SHA-1: 6348f82c0127d62a4abebe9915cbfb4da08dd786 SHA-256: 315cf624afc6a0568cd95c5b111291e77d0c4cc4405e5efbe4f9e6a8945e141c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crysiq.ru/uplcv?utm_term=goldilocks+and+the+three+bears+story+pdf PDF link annotation
    • http://youzedu.com/ckimages/files/20210906191008516326.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/65953282824.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/21966606476.pdfIn PDF document text
    • http://christopherdallo.com/file/35046227636.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/wixowinejiwujebukiko.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/jakag.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/58023613756.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/48591679469.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/60417617815.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358a1996620---11579865269.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/2593f94c8af1ae5bf2b87efa759b6c7d/xigepi.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/vupinaremoluse.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/bavukixokivena.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/71648332745.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17241475861.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/59069998089.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/71079702735.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/52923913826.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/86254572135.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/gawifofasolil.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/gutirujusokamiken.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/61307383211.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/78062120272.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/71017778639.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/39664311279.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_off0000d470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD470 11104 bytes
SHA-256: e634f1d3680775f2344685d4367e5ceaf015f9060190bc264c79b143cdf7d5a2
font_01_sfnt_off0000ee0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 18008 bytes
SHA-256: 8ccd6bab0b6d291829985412c3e9d6cd52a2618b34a6cd436f832cb01ac766a0
font_02_sfnt_off00011ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1