Malicious PDF — malware analysis report

Static analysis result for SHA-256 142a622fcbea9763…

MALICIOUS

PDF

74.1 KB Created: 2021-09-16 10:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c0b260c4b9ca0e3ce218e7c18bc96746 SHA-1: f57392feec19c47522535b9b08f7a9f1be3b76b0 SHA-256: 142a622fcbea9763db0ec74ac6767822636866e3c186c04270967feb6b4363e6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially malicious or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 http://wittlich-luexem.de/userfiles/file/97421881783.pdf In PDF document text
    • https://bbu.vn/Images_upload/files/mozobolavoxanivafetijobu.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/7297828821.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/wigimoka.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/73ug4bag9335jjncturovirbil/lokuxedoxezape.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/71708636153.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021916_1148_947.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/30193510433.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/diluxo.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/zubevakativibapemova.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/61307647049.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/demexupagibivebubomoso.pdfIn PDF document text
    • https://serka.com/serka/upload/files/rakofusa.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/60763655989.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/53240648374.pdfIn PDF document text
    • https://redac.ch/upload/nejaparosoleboxo.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16142c0e58eeac---78387127691.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/tafasefivuvexiv.pdfIn PDF document text
    • http://popmetre.com/news/files/muzejuxekafukele.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/97902085250.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/24143242096.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/18171400640.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-11/20210911120334578442.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210901_1FEE46E4CA5D77CE.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/tojilajes.pdfIn PDF document text
    • http://cx-gl.hu/images/files/28781323801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=mucize+english+subtitles+full+moviePDF 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_off0000bcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC8 16928 bytes
SHA-256: 28c6ae8b5d79a990b17716dcdf4e21ec8af4d9a5a5d802e285ec30488bec34af
font_01_sfnt_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 10880 bytes
SHA-256: b9118aa7a38076a1b08e02d556f56d01cf83cd76761fb35139df05e1c4945938