Malicious PDF — malware analysis report

Static analysis result for SHA-256 14b143deb574df33…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 06:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15de1c1290471d699775e0a092361b20 SHA-1: 65bc5b91a05ac333f838702e48a80729f5664fe3 SHA-256: 14b143deb574df3350372d84436a7904a4fdb70f4fcc32eae5b9ab2031233d82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating suspicious external links. The PDF contains numerous embedded URLs pointing to various domains, suggesting a phishing or malware distribution scheme. The presence of a 'utm_term' parameter in one URL indicates a potential tracking mechanism for malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ketchas.ru/uplcv?utm_term=euro+truck+simulator+2+download+android+game PDF link annotation
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210904115502.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/jamokadolelubewaju.pdfIn PDF document text
    • http://abworder.com/uploads/files/vipadevoteberaw.pdfIn PDF document text
    • http://tzsunup.com/upload/32537095734.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c6cfe25d7---49534094268.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/80094682927.pdfIn PDF document text
    • http://flirdining.com/uploads/files/75005772287.pdfIn PDF document text
    • https://toocapen.com/files/lipamugakorijajipifogose.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/31725064912.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/topatasok.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210918015549_r8ng6r.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/75028965449.pdfIn PDF document text
    • http://iltorg.ru/upload/file/dubodefugapapovuk.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/ladoxeje.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/xafetisijusisesapazuri.pdfIn PDF document text
    • http://dkind.net/userData/board/file/19243726842.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/94165814977.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/vizaroxoz.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/rilalogixugonol.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/makuwikijenopesufigefabub.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/bapezesusejijugulowowa.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_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 17448 bytes
SHA-256: e2f32cb8da44f289de67ba9af421520a84035ffb6f345f496a69d86c8b0b8915
font_01_sfnt_off00010460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 11096 bytes
SHA-256: 56a2ee58f9db0b0a685b91c511c7e98571345d1ebde744da3934bbabd6afbdc7
font_02_sfnt_off00011e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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