Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c58ff19f70ea44…

MALICIOUS

PDF

71.8 KB Created: 2021-09-17 10:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: efcf10c51eefb68d128e863eb145fcff SHA-1: a9fdc481fa9cfacb6d769bdb61a11d82b6df37e4 SHA-256: 42c58ff19f70ea4418de0c9b381cce6069e16a710f3c1d08a32fa365fc75be8e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the presence of numerous URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • 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://crysiq.ru/uplcv?utm_term=zee+tv+mod+apk PDF link annotation
    • http://laxycoffee.com/upload/files/wagesofugojuz.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/35511068059.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/kekadajimatoxig.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/refilabakixuginevutokam.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/kujavipituderupar.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/ligavejogovavesatigote.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/42985630450.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/dovamupa.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/dezitexuxidikelovobip.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/tezejumavomikasanezeli.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/07cc033c414224912abaf9382714d35c/36013845599.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/23457494290.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/62807162011.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/11044851952.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/94182215776.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/pefalazowolef.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/3708659629.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109011309018110.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161353e0499f82---35964967780.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/fizanokewabepoxin.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/70999492026.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210906122139.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/45606843062.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_off0000b97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97A 10164 bytes
SHA-256: 0e81e6633ea855a00bbb1b0861161ba5081d9126fab101be948e080be0490c70
font_01_sfnt_off0000d048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD048 16332 bytes
SHA-256: 042fb574dcbd68b650fe731181860399a2599481a7ed85cd9840072e48014c7c
font_02_sfnt_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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