Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91ebc561472cc6e…

MALICIOUS

PDF

77.6 KB Created: 2021-09-20 21:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd5b5e9097d7a96827a99a763feb8031 SHA-1: 6a8af76def5f09fc479f2e10b1af99ce273ca7b5 SHA-256: b91ebc561472cc6eb6a38cb3f80797ddab9937e196ea0a51010426cba0134216
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious content or redirecting users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload or redirect the user to a phishing site, as evidenced by the numerous external URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://oniceh.ru/uplcv?utm_term=where+are+developer+options+android+10 PDF link annotation
    • http://melly-incendie.fr/img_db/bemewizijiwitovataloda.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/woduzidasotuse.pdfIn PDF document text
    • http://www.celso.org/download/xiwuvawodimibelijilobapam.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/16526490338.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/14718165759.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/folotovasonopo.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/42827613815.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/1986839327.pdfIn PDF document text
    • https://parkettworld.com/upload/files/nevober.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/rixizorow.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/bazuzajabinuzatusaxatimej.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/xigudomax.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091417592680554.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/fonef.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/56811672297.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/69571106021.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/wanuno.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/scjuuk1pdr8g5oilmjvsj28ga2/24447142878.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/nitufidizufupiwowadu.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/23172174719.pdfIn PDF document text
    • http://royalgroup.at/tmp/xolokadajudagef.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_off0000c80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE022 10724 bytes
SHA-256: a8dd4da4ca042b8fec7911722c0d1d46ac7cd63f26c7fddb4fbd7d1ff055777c
font_02_sfnt_off0000f8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B6 18616 bytes
SHA-256: 861f57d07769a6c3b3825fa5ea247b3d04e52ce3b57736180334ec0a6151952a

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