Malicious PDF — malware analysis report

Static analysis result for SHA-256 952f20b51dfa7f64…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 22:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80257a5b9c8f2b6496419f972486a5ac SHA-1: c9607ec3c40fb530cc1f2711395dd62e03ea721e SHA-256: 952f20b51dfa7f640052ba7943a7aa3eab38ad0ef9b4d11357025f577a29a86e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The sample's structure and numerous links point towards a link farm or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=cara+scan+barcode+foto+di+iphone PDF link annotation
    • http://illinoislivestock.org/userfiles/file/zotodobilotawowugex.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/femejogisofexulete.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/paxisej.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/vonozosapuvikinanatuzix.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bebe7cdbb---65189583380.pdfIn PDF document text
    • https://equalland.com/uploads/File/zimovabozuviwes.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/89687294801.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/xatofobi.pdfIn PDF document text
    • http://machin.kr/userData/board/file/xajuven.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/newuxib.pdfIn PDF document text
    • http://fgosvo.ru/files/files/merazazezi.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/24399650214.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/657728756891631111840.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/paxujapokuberuzoteruwude.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/zaliforanajonovoxakifete.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613faab0085f5---57964470398.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/55655114490.pdfIn PDF document text
    • http://signauction.net/userfiles/file/77866701767.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/datakaxujitemirose.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/vubalexejodonuwexekotileg.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/davepiliwukipusativigev.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/nifizebimesodawi.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/67134061583.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_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 17560 bytes
SHA-256: f97a18fbca3707837f9706c2462d35ac2eabb00db9d45e7ec775b728ac53e4a4
font_01_sfnt_off00010932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10932 10840 bytes
SHA-256: 677e75c3799fbaaa06a5b39fb7515a2dd18aec6737ab2420baba79c975a27892
font_02_sfnt_off000121f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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