Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b69267a852d7eea…

MALICIOUS

PDF

78.2 KB Created: 2021-09-24 11:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 467b02810f44af61f4f40f2dc1951ddc SHA-1: 771a7c98d99e675744fe3d6fbdeb9fe9f4e1ed81 SHA-256: 5b69267a852d7eea3bcba8d5c1839af71dad47bb03d3be7ccbda6cb42416f712
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the linked sites. The embedded JavaScript may be used to obfuscate the links or perform additional malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=live+webcam+chat+omegle PDF link annotation
    • http://broadgatecapital.com/userfiles/file/84320437372.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/durexogawolimidopivolane.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/27311542364.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/xujolegi.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3b7a9ed61---gupijesu.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/83111290575.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/lizomitoxikefuvogoje.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/fisilog.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/41395418454.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/24106393159.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/jisegun.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/fepibajulekirorixe.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/fizepofumerimasujagudovid.pdfIn PDF document text
    • http://synphabase.ch/upload/file/29903303173.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/16745469591.pdfIn PDF document text
    • https://mycultureis.com/FileData/ckfinder/files/20210921_295B794604987872.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/venonorazagazobu.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/31932884303.pdfIn PDF document text
    • http://tabletopad.com/images/file/9915008437.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/nevatoxege.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/fitademexa.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_off0000cfb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB8 10556 bytes
SHA-256: abca97777621024c237adf11793ebc5ee07f8dad4f7c07375672f29b5e5d79ac
font_01_sfnt_off0000e7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF5 17044 bytes
SHA-256: f9874fff12fc534dea1a4d7d363481f27ff7be3887016b03f2d32a72152d9dae

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