Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20a6e70a02116bf…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 09:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b2054b996fe8a858670579adf2c639f6 SHA-1: dcaec16cdaea1ef47bfbfb76212e2b015f7831ee SHA-256: a20a6e70a02116bf7e54efcbfefeeaef54120e61831208b2c55760139e999d01
74 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of this document being part of an SEO poisoning campaign or a distribution point for further malicious content. The ML classifier strongly flags this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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://creativekids.abcedukacji.pl/web/uploads/files/pejavejovewinu.pdf In PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/89124227334.pdfIn PDF document text
    • http://expresskaliski.info/file/kesodin.pdfIn PDF document text
    • https://mentormedya.com/files/lujuresaramibukojebalen.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/metadag.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/wuwogejamiruxovitup.pdfIn PDF document text
    • http://domuran.pl/files/file/58881166826.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/dcl5q3bdv20rpvjrj69qrkd510/90464188285.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/witavibow.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/wuxegatemekofagofo.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/21233441701.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/bidogorumuw.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puwofagatukuj.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/nakujugiwusim.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/vafikotoruxeduvi.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/vixinadeligup.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/76281030632.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/53735931283.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/cc7434bc93c6d587fdfa56cb7649ead8/60647363834.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/28171228023.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/zajawa.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/11662181118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+sign+out+of+whatsapp+androidPDF 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_off0000d881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 17192 bytes
SHA-256: f4af9b65a50a415fd74404dcf76c2bcc33b1677a249c759f9d123f070a31f64a
font_01_sfnt_off000104e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E9 10776 bytes
SHA-256: 833609f10ec03ded84c62fd23b720768f78df658ed83c93c35593ae7009fdaa0
font_02_sfnt_off00011d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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