Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fabe075562d9b9…

MALICIOUS

PDF

70.2 KB Created: 2021-09-14 07:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97249311aed2445013a0bf294c08cb5f SHA-1: 68c22e0c0bb5b8558c23e195aa2000e0e16b972c SHA-256: 20fabe075562d9b9fd4023f07fcd30458ec71c1bb88c30496e67b37d5f1cc570
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, 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 to trick users into downloading malware or visiting phishing sites. The embedded JavaScript is likely responsible for redirecting users to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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=minecraft+pe+beta+apk+free+download PDF link annotation
    • http://herfon-machinery.com/images/ckfinder/files/20210902094819.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/23234057110.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132675e972c5---wadaxidimiteninet.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/baxabozizolisuxoverisow.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/17362047260.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/xadedonepa.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/didixuwigeb.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/52160615350.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/nufibudipatizesatefalim.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/14527545118.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/90850944321.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/jobutajulosisij.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/pafevapudakibimomoru.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/23036730911.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/69591462071.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/repopefonololojevarexe.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/38864034364.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/niwalino.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qlcp9e2lipmmojn0dr9d7vi7dk/roxaxazumuvexikanovod.pdfIn PDF document text
    • http://artediapharma.com/upload/files/nijakobom.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/20884175562.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/nexuzozutogivufe.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210909070724434396.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/95901302962.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/runojuwubaf.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/47068832637.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_off0000b561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB561 10756 bytes
SHA-256: b5d746279eae602599b22304fb04ac2014f6557960dce70e8bcd93ac2d83ffab
font_01_sfnt_off0000ce0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0F 14556 bytes
SHA-256: dfec6148fc5fa108d612139c88f06468df54a24df535dcdaf4aaeb16c04bcb49
font_02_sfnt_off0000f26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1