Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd770a9c7c6ed0f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 22:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4fce10cc6e706017d6444bdff356298 SHA-1: 77818f3dfd7766af11c09628e83071a708dade66 SHA-256: 3bd770a9c7c6ed0fb69215888ff70ba780e701010b9f4bb5aba185e7701d4a29
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 hosting and are used in a link farm pattern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=vmos+lite+download PDF link annotation
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137493f71a38---kuzulepavuvava.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/lonifudiwugebuzotumizusog.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/11796259721.pdfIn PDF document text
    • https://banghenails.com/upload/file/xigujesajebiguwojutuga.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/jufufo.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/fujisutomimolu.pdfIn PDF document text
    • http://kgmda.com/upload/files/puzusemamurur.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/38005742366.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/vabesilesabisofupoz.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/wixezugelo.pdfIn PDF document text
    • http://espwireless.net/uploads/file/rorunivukunurib.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/39072628783.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/goputakulefexevufoxuzam.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/19888034649.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e1a47672a188ec6a090fd2a1629e1d29/kotaresebinapigelalabofu.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/60167808515.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/82494041186.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/41079417927.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/95145039160.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/goxasaromuveselusekifo.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/zaxirixeme.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/raropazere.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/22899941139.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-6/20210906135735229408.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/gesalibejebawup.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_off0000db27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 18036 bytes
SHA-256: 5baa221d9f9e1aa8c9338ed307fbd82c425f0626820de69d9926968d8af1c5d9
font_02_sfnt_off0001223d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223D 10364 bytes
SHA-256: cf95ef67bf8e206fe010103ae633bf5279fb639653a608b4e5fdb2279ff7de8c