Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ca86925cd6c020…

MALICIOUS

PDF

79.3 KB Created: 2021-09-22 13:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ee984cf96e4388c1c8af3e4fb921485e SHA-1: d15fa1d0cfb6c0c7d5e51c35fad9f32534380969 SHA-256: 86ca86925cd6c020f05548004175db462c87223bf0149e5428ec1f032c5e380d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs, suggesting it functions as a link farm or a lure to phishing sites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=video+booster+apk PDF link annotation
    • http://romengo.com/ckfinder/userfiles/files/98919640747.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/rumezexafufi.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/jimapilolasozufifuroredu.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/99966426160.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/84327741170.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/kibude.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/90085504029.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/2471129505.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/83355663353.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/48117283066.pdfIn PDF document text
    • http://trieuduong.com/images/Download/wegavekakiwa.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/29476482828.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/luxukige.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1bd2f135f---fekumunigefalebesef.pdfIn PDF document text
    • https://pactforfamilies.org/ckfinder/userfiles/files/wulagimunabiriwusenudeg.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109201712177843.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/kikexuzavoriv.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/39394545942.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/99548823069.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/nupodabeve.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/xavel.pdfIn PDF document text
    • http://snft.ro/media/file/sepiralozanup.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109101929107464.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_off0000d154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD154 10436 bytes
SHA-256: e0eddd7b78061364597b81b355d6a448c8c05fe5e853acb031a0adf6c8b25247
font_01_sfnt_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10102 18028 bytes
SHA-256: 100a1a8738a673b9e5622a8150820d51c90dfc2ac35552ef6b7648f2e29ed9bd

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