Malicious PDF — malware analysis report

Static analysis result for SHA-256 2193ab78efb565cf…

MALICIOUS

PDF

83.6 KB Created: 2021-09-21 23:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b54456e1c075ac66b1ddc46fa3350ebe SHA-1: 0c336bc4be744e3499f7a9c66709b30b9fc84d39 SHA-256: 2193ab78efb565cfc9f4680ce69b668a4a7f00c0fa3c24f52f3fb9a9c49d69f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://hotelbasantresidency.com/uploads/buliviguxebu.pdf In PDF document text
    • https://softwebstar.com/shop/userfiles/file/lutuxotugijoru.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/105bef35cc8e1fa88688f5ca0a22a5e6/zulixuned.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/37997753863.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/tolami.pdfIn PDF document text
    • http://mlead.net/images/e/file/88296511040.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/kizoxi.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/tusuriteronot.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/21632283606.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/23913166492.pdfIn PDF document text
    • http://cobmedia.hu/include/vugedojekef.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210906065702.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/waduxetizefufowerogoj.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/kuzadiremowujafogexufog.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/56851771199.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/sazofopexoxezagesexud.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/bilesawujikawipete.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/lunibidoxubu.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/zofuferoz.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161424148640ab---midajulemo.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/ninijijudarixujepew.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/dodamugikexiwakitisumab.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/97644055280.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905073448408520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=read+aloud+web+pages+androidPDF 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_off0000db2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2A 20232 bytes
SHA-256: bb55f84e7b9a4cfab1cbff3779c07ff7b2b22c70b83bebe3ae597a20d1d1951d
font_01_sfnt_off00010fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDF 10840 bytes
SHA-256: 473f2a508e04d959a9c2d184746a5ea4187bfd5f833e62cc5a84e22f3e681bdf
font_02_sfnt_off0001288e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1