Malicious PDF — malware analysis report

Static analysis result for SHA-256 f60b41853ffa5ca2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 19:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 01623e149ffad22b816de002196652a6 SHA-1: 0be030797a29e9005329c1950269197d12ab7b3b SHA-256: f60b41853ffa5ca2a7375c70e56979021eda951f88bdae8444b3341e07401dd0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are on disposable hosting and use UTM parameters, indicating a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=lego+ninjago+shadow+of+ronin+obb PDF link annotation
    • https://cingenito.ca/upload/editor/file/lukuv.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/11743415710.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210909030123.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/laxaduvep.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/35460554995.pdfIn PDF document text
    • https://dm288.com/slicice/file/6694309648.pdfIn PDF document text
    • http://showdoimovel.com/files/files/tesizorezorizunupebuzu.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/4937e3a179ba4d352ea1333ba58140df/mujukuviwiw.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/fetuzuxuwekawisedusiwu.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/besuzetivor.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/79816447105.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/28870562042.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/19099939326.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/18723971200.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/62569782795.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/sasekixevu.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/1552752745.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/kiwutiposogu.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/69615057422.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/49553414741.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/revajevafidasaleduwirivaz.pdfIn PDF document text
    • https://majubesar.net/contents/files/15733867798.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367bd88d885---dezilolosidizaluj.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/63915183590.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_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 10800 bytes
SHA-256: f54aa6a69c7b1012f4858c9cb505d64e6cb2d3830fe02df8cdb4194a02e41095
font_02_sfnt_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 17500 bytes
SHA-256: 259e1f8d45cd8b8f18c1d0ae6f90357ece931a908fe3c9be94bfc7ff0d0ee9c9

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