Malicious PDF — malware analysis report

Static analysis result for SHA-256 59910952ecbda1d8…

MALICIOUS

PDF

72.0 KB Created: 2021-09-12 17:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e5f9dabe6310c8f84ee7fc699036e103 SHA-1: 97551e030dcc5582a93e71d691ae525729e8fe07 SHA-256: 59910952ecbda1d8f1e613b812a96c6678bc2e852591736c2a49f1e2904898f5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or to serve a second-stage payload. The presence of JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=boom+beach+gem+generator PDF link annotation
    • http://tokyosushilohaus.com/uploads/files/vegafatorolulojuzaz.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/bodunavexexaxov.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/sobimakefolibenap.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gigapupulabufos.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/58235343995.pdfIn PDF document text
    • http://skupka54.ru/upload/m/22283773468.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8gcuqq54g0pdmfq0j7l9c5s2pa/kajitulotowuxiwovubaz.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/18130382854.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/diwusatakali.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/talokefod.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/gukuvo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec73bd9e1---taminubukewama.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/41523073687.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/fuzezuxewalekuv.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210902155224.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/72058290509.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/tulelumuzawawiranax.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/63d5ef1f6d0cd853997700addc0221dd/bisumu.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/49298165337.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/89651950236.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/kuzukuxevupagaja.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/jexurigipometizosav.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/82902083627.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_off0000b736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB736 16836 bytes
SHA-256: 8771c9355897ac1a0405cd36d76fa5d3be2554826e121b6052597517765157ee
font_01_sfnt_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 10564 bytes
SHA-256: cad4f44c88467c2cf9304eef7fcc88c6bcd44689b4010989d5c7db2d3c658ed4
font_02_sfnt_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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