Malicious PDF — malware analysis report

Static analysis result for SHA-256 a293114d7dfa8df8…

MALICIOUS

PDF

68.6 KB Created: 2021-09-30 13:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 55f9864b5906e996e8975b9ac626a9d1 SHA-1: a83a14d106d3291a298446e8ae64198b1d4b5510 SHA-256: a293114d7dfa8df81a9e9d24083d81baf730306870ad389535277b1b2fa6ad0e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains or are used in a link farm pattern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=vanaspati+tantra+book+pdf+free+download PDF link annotation
    • http://fge-service.com/userfiles/file/koneturipusalumufa.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/37278941104.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/13657485172.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/29581545332.pdfIn PDF document text
    • http://showdoimovel.com/files/files/14603791471.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210911125634.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/nerax.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/duxazapamaterebogoxi.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142dbf9ea934---nosise.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/jokisefarub.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/monujenarimubimapiteluti.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/87421072703.pdfIn PDF document text
    • http://minipit.com/data/files/49095175915.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/40523782701.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/jinezamagenuvi.pdfIn PDF document text
    • http://oris-am.com/editor_up/nunirapamusinor.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/45716874373.pdfIn PDF document text
    • http://fourfoods.com/images/files/79068535038.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/mopegurir.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/jenakugipeduragedogesokuf.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05d249481---dajimibufelagorenumesafo.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/56971759546.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_off0000af4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC766 10780 bytes
SHA-256: bad82ce216cb5c2f0cbd6bc9b89eab814dbe0a8b44921b8810e85e82b44da8a1
font_02_sfnt_off0000e036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 14592 bytes
SHA-256: a454f8e621994df6717fa6a922b3dbc9830b8ae79388321531ab087b1f9eccf1

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