Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8042881349f9db…

MALICIOUS

PDF

85.4 KB Created: 2021-09-16 00:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 262b7fb407913258bbd345c3fbb72a95 SHA-1: f9c76a90e2851114964ea663acfb08f757fa22c7 SHA-256: 2a8042881349f9dbc23ef0f9ae481dd21a6b6f0ae953ea816841de86ba7d2d74
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic identifying a link farm suggest the document is designed to trick users into visiting malicious sites, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=weather+pro+free+download PDF link annotation
    • http://studiodispirito.it/userfiles/file/19890887536.pdfIn PDF document text
    • http://esistore.de/userfiles/file/puvoxozegowefesal.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/jewefi.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/dubipenedanuvuvewor.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/xegutu.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/bewadu.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/91970593510.pdfIn PDF document text
    • http://fitviewer.de/files/file/motefabobuluxifugad.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/0daca3b1220583ce49c647be670b8509/82243424355.pdfIn PDF document text
    • https://austarpharma.com/upload/files/wupidazadafatofo.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/69267651831.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/51921592901.pdfIn PDF document text
    • http://compsult.net/userfiles/file/zimavuxepukuvopupejegavix.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/8536105538.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/20565504841.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcbaf1cc1a---59198953282.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/551308_kofaxukewiv.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/83806872086.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/98279520709.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/76264732836.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-16/20210916050143136297.pdfIn PDF document text
    • http://xtra360.net/campannas/file/zudejotibog.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6151428451.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/16306181164c5S.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/66362303819.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/mafazitefokenuvinuvabaw.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_off0000e86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 10412 bytes
SHA-256: 04d35164062dd7e28163e98b1b685cb0df1f0f9a2c13dc6c1c095100afe98346
font_01_sfnt_off0000fff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 18180 bytes
SHA-256: da034cab9fd665df0d1fafea12831260cd143c99e85ce1b8846f779fb3b531e9
font_02_sfnt_off00012fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1