Malicious PDF — malware analysis report

Static analysis result for SHA-256 876b3a84b389bdfe…

MALICIOUS

PDF

75.0 KB Created: 2021-10-01 04:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 85ff6ec1f758e57b14a28141de732679 SHA-1: 32af4226a0b6d332487ba6913bc9ddd06d74d266 SHA-256: 876b3a84b389bdfe6c574b325a1b5aafdf824e5dc8b3051614ab354791b98ff1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links pointing to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://oniceh.ru/uplcv?utm_term=como+colocar+controle+de+ps3+no+android PDF link annotation
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614129b748b50---monisolokegufa.pdfIn PDF document text
    • http://tianfonmm.com/d/files/23537954895.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/22041339850.pdfIn PDF document text
    • http://hbinpol.cz/media/images/upload/file/97693979841.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/naradidipugawumipatu.pdfIn PDF document text
    • http://slsnn.ru/content/file/kukeg.pdfIn PDF document text
    • https://norservis.cz/files/files/81504164959.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210922055822.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614194d361e2b---sifosutisikidemuguzupu.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/dotigokolesazezekewugej.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/85028927369.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/volulonex.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/80269931544.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/5084542682.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/49752604471.pdfIn PDF document text
    • http://beta-rc.com/upload/files/61595252615.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/tavejuvigutodevalil.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/pojez.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/94008110321.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/saxiwuxepokatitesipe.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/mitasavopubufozagof.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/76264749894.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_off0000bca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BA 10876 bytes
SHA-256: 77ac6744d90c1a22eeeaada353b4dabd766bfb546b93754c965a68d4cde00324
font_02_sfnt_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 19052 bytes
SHA-256: c72d570b45490a3be84585e144391749cc344471627ea8d0f30beafa215b2f08

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