Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0f625b6fd471c9…

MALICIOUS

PDF

85.7 KB Created: 2021-09-21 15:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e933a328b3721afb2dec553669c460b8 SHA-1: 826f722d2e2dc62cb909c655f87289d79c8ab92a SHA-256: ed0f625b6fd471c9f90ef6717cd89910ae8e6755fcd28a99ada6f3638e1783c0
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 part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to redirect the user to one of the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crysiq.ru/uplcv?utm_term=use+phone+as+web+camera+via+usb PDF link annotation
    • https://zlato-stribro-investice.com/upload/files/84575074377.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/50802990844.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109161700031635.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/3795539087.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/wofexinalujekumitewugedan.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/nofomo.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/93300173340.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/36039248756.pdfIn PDF document text
    • http://sparkpro.lv/content/file/lefogemulame.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/85295816857.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/1039822900.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/medufuviduvuboparot.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/79640500239.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/54854207266.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/gogareno.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/75847107132.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/vumanorawejazajalixog.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/zidadazaso.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/kuwaxonorumabafina.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/zananekukoboxazomigojamo.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/mosezajobibetijelox.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/govik.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/56087612561.pdfIn PDF document text
    • https://glozor.com/userfiles/file/76625527023.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/6123228716.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7b46b68b2---zuginulofizef.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_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 19876 bytes
SHA-256: 4b4c45f3fae5f54f7e827ab5c55b5c01f410fab88e250a38cdd186b9f29e00ec
font_01_sfnt_off000117b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B8 10896 bytes
SHA-256: be297b4180440756fc692fb15eacbf8688dc3b8eb4eea3929fa5893f333daa27
font_02_sfnt_off00013096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1