Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3829e26fdea409…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 06:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e8fbd6f2b4d3807327822686ee73b55 SHA-1: 532611da729c75122eb6890d8194899b664e41f4 SHA-256: 8c3829e26fdea409749c3357c8b0d763882302f40b893820a69b19a847b23b0e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The presence of a 'download button' heuristic further supports the lure of downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=praveena+novels+free+download PDF link annotation
    • https://cooperadora.grupocreartel.com/documentos/archivos/87152846160.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144e08f9788c---roxokisune.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210911021147_1008050093.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/nonolumogiken.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/pilegamegokaxixojarofavu.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/39523766552.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/21232076952.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/5625769417.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210904044529266122sj9hy.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140dc3c27a54---motipulimutazosilason.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/gedotowa.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/zapinetotomifakaleb.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/vipelupazozo.pdfIn PDF document text
    • https://zagi.hr/files/wawaleludewij.pdfIn PDF document text
    • https://airxps.com/userfiles/files/18284013253.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/mowipajojasin.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/kowivobumumovugebo.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/51518335023.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/gepovanukoseruzukozepi.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210901174513.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/jadawojefatubixobedutudik.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/buxaxewabotufirudi.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_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 10312 bytes
SHA-256: a48fd01620fe4e2b501da238484391c91845cb81a2bf4f6fc327d949f1ffd4f1
font_02_sfnt_off00010d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D06 20020 bytes
SHA-256: 2a469612e62ff6b495c1facc17bdce832e18bfed44fd041a68a8bfc2daac1835

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