Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68d763e4695b22d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 13:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b29cbda45e5300f4417b4f249f7220e0 SHA-1: 870ca7e76cde4983a0d5e69acb6cd62cf6a77a2f SHA-256: a68d763e4695b22dc4ba3b2fa3615bb9370e295bcc26210855e35c1af6caa2ba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 distributing further malware. The document body is heavily obfuscated and unreadable, but the presence of JavaScript and external links points to a common attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=battle+royale+mod+apk PDF link annotation
    • http://skomi.ru/img/files/file/dadadopalavegujisowonunoz.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/sogefijaxilulusikinabuk.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f86cc9f46f---fovuj.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/64175704618.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/29196220986.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/tilojuxaxotofegisog.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/kabagusokutoresenutuvig.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/41653423956.pdfIn PDF document text
    • http://falerisztika.hu/tmp/75525280517.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210907205113.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/68505078380.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/tojetelateburenasopo.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/dexusarenab.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/83249696737.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/guligaxodesotepuxanipomo.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/fevolalepajinip.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/fuliwelidujeduneruwov.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/wudozo.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/gavowapenadegabisi.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/45105417619.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/sifetorofenofurotojinojis.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/ramokab.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/7356500789.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_off0000dfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 17232 bytes
SHA-256: 0316059c9ec498a978427b618bdaadf31bd103e5a0dddd840a53415954bad510
font_02_sfnt_off000124a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 10448 bytes
SHA-256: 680f9e86cc35245e9265d59fbaf6172a0366fd0b64a9ff7cbd7be55f7b0d48b6

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