Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97e3094fc93ebdd…

MALICIOUS

PDF

71.0 KB Created: 2021-10-08 15:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 35a8dd26e74dc164a9b1057a588a7392 SHA-1: fa2159727a8d050b1f265f8934b0c8cd7f324488 SHA-256: a97e3094fc93ebdd375f7ccbe053dc0ae3cb3053d3f8d7e2d59617082551ae20
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=comic+creator+app+android PDF link annotation
    • http://loscogliodifavignana.it/userfiles/files/35135907324.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/71484931242.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/31593484453.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/58130049648.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/wozofevezagemit.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/savajuligerititivutitika.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/7723845311.pdfIn PDF document text
    • http://plise.org/userfiles/file/xugulorimogiv.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20211002_015702.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/jifuxusedoxuvovujixobibas.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/semazulivuguzuforumo.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/71252917262.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/42445128284.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/88932802869.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/45944769714.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/60388837468.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/57184163307.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614910072d6f0---xaxobitelenipa.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1615c91cc75cfb---laponexovix.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/80459205159.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_off0000b3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B8 10492 bytes
SHA-256: 95cb16077d02b4db2dae1f000ce45e0de1cd114a27e00aa87be03f796309bda9
font_01_sfnt_off0000cb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE399 16900 bytes
SHA-256: eb1324b7340bf7b49be36a473ce249d7e3995ab90de0c5ad7f838d15497dd92f