Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d1cbe362b116b3…

MALICIOUS

PDF

67.4 KB Created: 2021-09-30 13:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2361ca36f81f39c56ec8d3997c77c7a4 SHA-1: c7e1ca3f798c271e6b3e3a1acccb661a43818e3c SHA-256: b7d1cbe362b116b3474126f8b6b238e9e50d6376f4a1b6a134e00c9456e86a93
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://u15.ch/ckfinder/userfiles/files/webubokufage.pdf In PDF document text
    • https://happyfun.tw/uploads/files/202109171344221798.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/56396452808.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/ratesipek.pdfIn PDF document text
    • http://otczenacts.com/media/files/vilivesuzimutedepe.pdfIn PDF document text
    • http://dakmet.pl/upload/zotogadelorexox.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16140aa3a33aab---bizipakifidefobulakadaxe.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/xokuxozamoxafexekabe.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/tizedenunipejoluga.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161495af745ec6---dojenomojamivorumidib.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/zigojaxiv.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/zitinazatedabuxodu.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/nusafupavuxusam.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/99236357494.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109250954149513.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/46485763406.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/xugilazasobodugewako.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/96577061620.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/95064276349.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/monoto.pdfIn PDF document text
    • https://codefon2.solar-napkollektor.hu/js/ckfinder/userfiles/files/92286924876.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/64046327255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=game+mods+for+iosPDF link annotation
    • 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_off0000ac2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43C 14720 bytes
SHA-256: 7db939a35ef991db6fd1b9de43478980d8107d65d4227425f9c775641025ca99
font_02_sfnt_off0000e927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 10308 bytes
SHA-256: fc4aad65414bc7086c713e99cbacaf992b6902af87bded359513d0d237f96ccf

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