Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7c16a75f549388…

MALICIOUS

PDF

72.1 KB Created: 2021-09-14 04:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d65a77c1b86d575d534bb760732e7904 SHA-1: ecaa1deab0a47c9dc79452a4fba27019873a0943 SHA-256: bf7c16a75f549388573ebf0ed522a6f61965c60f8d24b5ab9128ebf96cf5dd7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or further malware downloads. The presence of embedded URLs and the classification as a 'link farm' strongly suggest a malicious document designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=bubble+shooter+tingly PDF link annotation
    • http://konberdbio.com/upload/files/xefinusosulo.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/78426198313.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/vuxomenixaxagite.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/logisop.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/52150099158.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/15071830315.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/29734017720.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/79838144214.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/38ea54a3f7a47befcf454eeb654263fb/sexanipixupajej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9579a73ea---tejokurot.pdfIn PDF document text
    • https://heureka-cz.eu/files/zixewu.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/getasa.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/92230489143.pdfIn PDF document text
    • http://gyliver.ru/files/files/33234203936.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/4931920862.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/39807318280.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/rufoxovuxevajujewamilekav.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/vaguvajupire.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/dejigenunanuma.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/nifuse.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/dujegowazusefosugevo.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/xulabiluf.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_off0000b892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A9 10632 bytes
SHA-256: fbcfe874a4b7b059f4139e01a3d8a05221eadd5f60363d66b33f378c9448067e
font_02_sfnt_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 16464 bytes
SHA-256: 6951cebf8ea9378fec80a4fc6f623295d42df6684baaa75468b1411d7e4d5257

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