Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7fd61f65ce8499…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 09:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6481813ec9870d9ddfd0efcfbe14a156 SHA-1: 95ae9ece30fafade7de92b12f8422deca80d9134 SHA-256: 3a7fd61f65ce849936cea828eb6e4b08dce863f66afde4f1d07a43d0cea222d5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://krisoc.ru/uplcv?utm_term=download+free+fire+game+50mb PDF link annotation
    • http://avtokit116.ru/!upload/files/52802993659.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210911090252.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/rereroduzu.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/togobupatukuza.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/zigokul.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/zakile.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zixorazilorulimenivo.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/69678997780.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/40095700601.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/fevolalepajinip.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/zepazu.pdfIn PDF document text
    • http://chinahongji.com/d/files/dawutasonubula.pdfIn PDF document text
    • http://dalaichau.com/files/24099084983.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/wopukoderasudera.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/59526479131.pdfIn PDF document text
    • http://fruitsad.pl/images/file/juzorezekadofajelejimama.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/90287555638.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b29e530723---pivewelubu.pdfIn PDF document text
    • https://servauto.fr/img/user/file/79129425925.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/vasimonuvakunigixi.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/40384064226.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/71289047399.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/22693649860.pdfIn PDF document text
    • https://kokomanis.com/contents/files/simenozaw.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_off0000d71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71C 18340 bytes
SHA-256: 16c0e22c1eef4966926e486acee311d9e539a8312c0a4101a7c0789ab811dedc
font_01_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF0 10916 bytes
SHA-256: 93f8bf14b30bcc14855e617a917b5565171c234059edc9f6faa3b8f6250a4210

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