Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e13c6f56b9e302…

MALICIOUS

PDF

73.2 KB Created: 2021-09-22 11:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c511d25bf3cca48d22f7cd785bc08f3 SHA-1: 6c04c82c00989b8d1b4d3460c13bf71f4a1f75c8 SHA-256: 91e13c6f56b9e3025e675519df26eca401b0dacb083b95e44871361ba0192803
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs pointing to disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=exodus+live+tv+app+apk PDF link annotation
    • http://sanmorales.es/userfiles/files/zorozu.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/86528753633.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/tekujidobavinotamilela.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/buvinawagipeta.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/46872831924.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/69029001659.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/24698827231.pdfIn PDF document text
    • http://alptw.com/images/files/75161703185.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/mexolawusozotapa.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/fazazijuludojelek.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/t64l8eomn35uasgsc2v1nksqb4/zexunofat.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/xirefiwebiwetolita.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/73865241646.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/46181121188.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/lagotavuduxetifuzaziz.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/91531819666.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614167adcd7f8---pawotajonawakokidiruvu.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/nanokufelizakixipexanimo.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/2259265503.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/mabawakevonekopilaki.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/28805252513.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/lemalujupebiniteriwujokow.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/64869552746.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_off0000bc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC39 16748 bytes
SHA-256: 900519129b5839f8e0878214f038826879f5b13af3adb4a5b974f0be714e2d71
font_01_sfnt_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF57 10524 bytes
SHA-256: 6049bc563923744dfb0257e0ea8706fa107c3e1d70f5adae384ace0866c34118