Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf7c0f36f334242…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 01:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d51bab09ab50ed14ceb6fd110ccf6d6 SHA-1: 5a8a97760b4270e9c8e9fb0113446b6935a97542 SHA-256: daf7c0f36f3342425f786dc033a0e6c115227b7aa8b917b5a1489dae2ce8679f
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 a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hinodecoder.com/userfiles/file/sijijuxirutinobepef.pdf In PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/96451532281.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/7437406848.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/wedutabadada.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/10108514906.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/jetuwotuzokasevogaku.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109060655437929.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/rabenabe.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/saxukisetubo.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/tosimos.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/6907826242.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/febovexezodimo.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/kikaz.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/bazosibikabofaximop.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/jefutufebotakawurexuxu.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/sezuwik.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/60762462961.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/63821118557.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/giwuvulabagosa.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/83906928698.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/14581336399.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144f6e37abe2---3502917211.pdfIn PDF document text
    • http://yejida.com/userfiles/file/xogejinegijexoji.pdfIn PDF document text
    • https://wasael.com/userfiles/file/pepojovered.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=search+the+web+on+chromePDF link annotation
    • 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_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 17856 bytes
SHA-256: 8443b199e0225bf26896611ff67177ebaa0304d1e016b3ec67e9bfa82e005b3f
font_01_sfnt_off000105d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 10492 bytes
SHA-256: 0d0ee7df51428f19ec70f5849fbf75e024302be292772ac99e09fcabbefabf67
font_02_sfnt_off00011d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1