Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d986a9216d3e5e…

MALICIOUS

PDF

89.5 KB Created: 2021-09-21 09:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b893cd5914fd05ab06d984502d58599a SHA-1: b99fc92f5359446ceeecd5228d31baab0862d22a SHA-256: d1d986a9216d3e5e019f47c970760654a03712f4d10443787741d2ffd28374f9
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=emoticon+for+hug+android PDF link annotation
    • http://yoshitomo-kokubunji.com/jcfiles/file/jexoramawobenuvulizu.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/16201741160.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/7761910912.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/xavizozazeneparivu.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/18686725.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/22443409769.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/sitavesagexixejunav.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/22060774473.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/momujitunixeloxaregejev.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/41606123785.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/wexewilewapiridu.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109062307121048.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/51552984852.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/xuvasiz.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161329d71983ff---39951989080.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/50567023226.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/46716053363.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/57826899393.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/jonoluxoneta.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/8081447977.pdfIn PDF document text
    • http://saktigroup.in/uploads/feduwijovoxa.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/voduzaxuxobexu.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/19370041392.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/40755295844.pdfIn PDF document text
    • http://katachizu.com/img/news/files/12952899079.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_off0000e765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE765 25144 bytes
SHA-256: a697128070e4874fb0782b80d8e5f5d18cbd22b710bb19ddc9b5f5d2bc2bd8e6
font_01_sfnt_off00012744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12744 10660 bytes
SHA-256: a7feb66efac96a716d5adcdf9249ee5f148f06cafd9866fa0a5260b3a42ad669
font_02_sfnt_off00013f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1