Malicious PDF — malware analysis report

Static analysis result for SHA-256 4baba8641aedb3d3…

MALICIOUS

PDF

84.5 KB Created: 2021-09-23 01:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5fa7dc9679354dbc247b4179a3e316a6 SHA-1: e909aa63fccc37971de0c6b0e2740c81db10e6c5 SHA-256: 4baba8641aedb3d3af6fdf5902b2993b52b588e50b03c31574b02113ee47bc6c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many pointing to disposable hosting, and is flagged as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://msdoubrava.cz/foto/images/file/58369968997.pdf In PDF document text
    • http://mixmarketing.vn/upload/fck/file/33200090389.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210923062350.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/14253872651.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/32860490037.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/52959628108.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/fewawexafubixozokaberamel.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/zitikabesewosukaruzesele.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/zikogumun.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/kuwaneji.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/99004853367.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/66340022135.pdfIn PDF document text
    • http://belovosushi.ru/files/giwipewide.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/lefukotijosovido.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/80758065139.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/tepomewogusaxafikopiwale.pdfIn PDF document text
    • http://katachizu.com/img/news/files/64089350010.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210912_145700.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/42450716854.pdfIn PDF document text
    • https://bunianco.com/other_files/File/pozexedojedokofezik.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/eeaee16f0c5b0ad3174ead8c862ad287/83626545177.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613867b5160d6---dagovalitod.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/87774952119.pdfPDF link annotation
    • http://abwingscolley.com/uploads/files/19010979557.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/43031283371.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/konopuxatobapolitaxavuz.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/xufirani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fake+credit+card+generator+with+namePDF 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_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 10756 bytes
SHA-256: dff7857b3ce4d687f0d533df058d144429e77b7d747cbd9dd81994ac2c374f94
font_01_sfnt_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 18036 bytes
SHA-256: 981d508327af13086d2d1e49408cd89db9c9a17865395893b046bab3b2fdbdb2
font_02_sfnt_off00012bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1