Malicious PDF — malware analysis report

Static analysis result for SHA-256 b070bd442bfd1eb2…

MALICIOUS

PDF

83.0 KB Created: 2021-09-14 02:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54a4a5885b55c662468bc59671f0c2fd SHA-1: daaccbf1af417074198660ad14b240597c1c6b78 SHA-256: b070bd442bfd1eb2c90394bb3499a37a281efa9655dfca90e9eddb7c0ad71a8d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://archism.ru/uplcv?utm_term=how+to+delete+app+cache+android PDF link annotation
    • http://ingpiazza.eu/userfiles/files/roxojowatugidabop.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/12/file/fopufademozaxuxedokoz.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/dokevozoriganegevome.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/pejaxamefakuvaxofibetajad.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/38197369338.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/wofopa.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/dixuxubisoniriban.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/zasijipafa.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/54624735090.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/79258214038.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/81801232758.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/dazakalowipomulirid.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-9/20210909125008985796.pdfIn PDF document text
    • http://adveotec.com/img/file/jojal.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/42855627340.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/72189428388.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090623543373499.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/dodabixujimikug.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/14136365896.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/kufamegud.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fcc75787a---32824459782.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/r1e2bfjffmt8j491rn6m64cqi2/44630527715.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/zowelejag.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/85645925111.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_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 18160 bytes
SHA-256: 23ce983a540a46eb6df7fefdcb5581d49eaf72986ff0d158bc8886c7ff61d970
font_02_sfnt_off000126a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A3 10520 bytes
SHA-256: dc10cd919839956ac78035ebc47a03fa461f09a2aad44c85f766870fd7849031

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