Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c627d7d746098f3…

MALICIOUS

PDF

74.7 KB Created: 2021-09-18 13:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b018eebe342d6731cb7e957eb4677f5d SHA-1: cb9802f001984be554d28dfef973b2e833b3480e SHA-256: 7c627d7d746098f3221cd2f2afc5150abf9da463f667f43e5522e4419143f5cf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://ternovykh.ru/content/file/fuxukota.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbeeaa1f8d---59934441785.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/18001432455.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/pegesolokibalogifofumi.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/89742931654.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/64127257134.pdfIn PDF document text
    • https://curvy.tw/upload/files/45592725292.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/fasuzalab.pdfIn PDF document text
    • http://smirna.pl/files/file/53011005483.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/87467000671.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/68798141049.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/fidoxukagafuboninulopovez.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/kapagatofulidefon.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/vekitumeson.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/2794043817.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/bumit.pdfIn PDF document text
    • https://ka-base.no/images_students/files/luwebulajekuveketomepok.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/99868689578.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/17280060326.pdfIn PDF document text
    • https://istanajp.net/contents/files/difenefivelogudegugaleta.pdfIn PDF document text
    • http://skene.es/userfiles/file/xevexorut.pdfIn PDF document text
    • https://qkon.ca/images/file/mixewelu.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/687941675.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/tikibo.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/niwinakamuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+win+friends+and+influence+people+free+downloadPDF 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_off0000bfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBB 17080 bytes
SHA-256: dfb2915ecb4de5b13f148c1094dce4dc128fb0b1a38fc6854f0eaab16885f720
font_01_sfnt_off0000ebe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 10792 bytes
SHA-256: b32dbd19fb2ce2e2272b21a7076f72c9a82fb7b497d7bda898ee4755a9acd37c