Malicious PDF — malware analysis report

Static analysis result for SHA-256 93669426e00b06ac…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 08:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8bd9477cc423348495e6b6182dd949a5 SHA-1: 8b1769e48b4524a7b4b6c0616c30052eb1b9f59f SHA-256: 93669426e00b06ac374782da235db1815c8cf9271290c9c5e644e2e4a4dfc4ae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous external URLs suggest a phishing or spam campaign, aiming to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://krisoc.ru/uplcv?utm_term=english+file+upper+intermediate+third+edition+workbook+answer+key+pdf PDF link annotation
    • http://myphamhelios.vn/luutru/files/palazipi.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/sejuferodevoxesaw.pdfIn PDF document text
    • http://canvangdientu.com/images/file/babonosev.pdfIn PDF document text
    • http://ranch.pl/files/file/bagazajunifi.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/mabiririnetokimirife.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/23050234260.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/tofurofofek.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/87874341943.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/98067899160.pdfIn PDF document text
    • http://lagrupacio.cat/file/xuvuxowozulepixedupa.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/56023069625.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/61094482338.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/bofopa.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/bogosebovafonavawifup.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/maludunemunijosu.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdd6ce23f1---dosovixip.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/tuginixetoro.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/51898316658.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/66725051723.pdfIn PDF document text
    • http://anm-av.de/uploads/files/45333110593.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/mufaxixezesafiw.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/sibajemuja.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_off0000cfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB5 11460 bytes
SHA-256: eadab0e7c22b8d64f09d50ab662e16b96f55b8df48ce818e46cb30f372a2067c
font_01_sfnt_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 18288 bytes
SHA-256: eacc3644d394251e0c474851789e94f828927b7da2bda548726ebe5e16b3896c
font_02_sfnt_off00011a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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