Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8897a02faa2471…

MALICIOUS

PDF

69.2 KB Created: 2021-10-05 19:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7e103457bb1dd910510f675846989119 SHA-1: f49e13206dc1ac155c1e869f6c13df358b526207 SHA-256: 2d8897a02faa247170c21f62aeabe9af7df850f3db0333c065bc3de7b908d976
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://synerhu.ru/uplcv?utm_term=plural+of+six PDF link annotation
    • http://estatepie.com/files/userfiles/file/saraketafimomoxuvil.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/260128177203.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/gonamewatesibafopadod.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/94289272.pdfIn PDF document text
    • https://linardi.ru/files/file/36435020435.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/1361444009.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/derugaxa.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/95348922745.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23245518475.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/14231145099.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/xawexogiwaxapurozivaz.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/puferefagoduk.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/momanoxunamo.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/19947362793.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/48606960626.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/72675430428.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/39249875234.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16135c0cc3534d---felasalaputulozatev.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/jazurede.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/24621394037.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/webipitekijomozunobuxez.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/84345166269.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/48507295894.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/25509846730.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/45091026971.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/tetupezevupoj.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_off0000b41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC31 14636 bytes
SHA-256: 1cb62a222000e44cf9326eafc7724300c9f20d1c1486b4e7d6ce8568194821c3
font_02_sfnt_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 10076 bytes
SHA-256: 1b292470cc7e888ff2f28a57151fa13ba7eada4d09d7ded94c31dbeaa4b3592c