Malicious PDF — malware analysis report

Static analysis result for SHA-256 818b86c4e7c1ef0a…

MALICIOUS

PDF

83.5 KB Created: 2021-09-22 18:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 621d668d6934e7d9de932136145e256a SHA-1: af693261e1d21b271366e294ac26f6894b42cbc0 SHA-256: 818b86c4e7c1ef0aeec066c87166a5f66597d1191e0e738076fe072a189d40d6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also hosts a large number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://intelekt.biz/uploads/pages/files/posutisogevuwanej.pdf In PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/20839819370.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/22832805735.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/17280804075.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/20365334306.pdfIn PDF document text
    • http://erpos.sk/data/files/ruxenuneruso.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/kelizefodup.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/lawununepul.pdfIn PDF document text
    • https://patc.fr/imagesfile/tabezodafara.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/lulofexipapasiwota.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/21114607598.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/93220394251.pdfIn PDF document text
    • http://ecole.ru/text/images/file/japarudunofopevenunuk.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/motewewegubegu.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/60300282028.pdfIn PDF document text
    • http://classtool.info/upload/files/11660643833.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161482b3c7492b---pirezajuzajufa.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/kurire.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/95075956513.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/lovokabobotewuj.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/wejaramixovazawaxoj.pdfIn PDF document text
    • https://harmony.im/userfiles/file/22516991956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=peliculas+en+espanol+gratisPDF 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_off0000deb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB8 18800 bytes
SHA-256: 11249048fbd657c4b50275bdba252b99f373cd770fc61c182543e37e06ea5094
font_01_sfnt_off00010ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DA 10652 bytes
SHA-256: d5a8c2ee730e4301fa523eb48dc60e4c7bde0bf92f55d16ea66647bd34ee69ce

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