Malicious PDF — malware analysis report

Static analysis result for SHA-256 513cc639118fc97d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-22 12:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 61803a2f6e83784002aa5b79fcfbb2d8 SHA-1: c28ba0735a795b9d6626c143cae63c584ec0e354 SHA-256: 513cc639118fc97d156e84d355e881f813ab9f9e95f627aa1e2c496e376ed45e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of JavaScript points to the T1059.007 technique.

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://krisoc.ru/uplcv?utm_term=redmi+4+android+7 PDF link annotation
    • http://elcivan.com/admin/UserFiles/file/radeluperumowefimapimev.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/u79471idq9kbubl2ng3gvu8q4h/tuvilofa.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/wubezetozebe.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/2295859008.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/penavop.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/17819291008.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/wasotiruzuwewusigokomu.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/kofuzatakorezapedu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd91fe7cb2---90534146499.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109102101368961.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/vubifaxiketakoz.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/mobega.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/93650688791.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/kevekakojiteza.pdfIn PDF document text
    • http://hangquangauto.com/files/7788165152.pdfIn PDF document text
    • http://contelex.it/userfiles/files/48617721319.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/86112000582.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210905002407.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/39155355162.pdfIn PDF document text
    • https://phnews.ro/files/file/gafalewiwag.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/vajasav.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16146f7b935d6c---31895879488.pdfIn PDF document text
    • https://maturana.cl/upload/file/xixexuzugow.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_off0000dc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC29 10268 bytes
SHA-256: af600e2de7159410a3665ef61bd33f59aee3e44d897108c662741c6731ba4db5
font_01_sfnt_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B58 20604 bytes
SHA-256: 54a81299ca423f7a4c1de66af536f7591be7d66a1f60676442d840456e34aade

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