Malicious PDF — malware analysis report

Static analysis result for SHA-256 d341b81061d416d3…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 15:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01989483c4536c55c41774a5aab86d53 SHA-1: 530ad62c6ddb6eb7648ce17f87a5c26f2f153043 SHA-256: d341b81061d416d3d0221f906757d81949a9179e7c289550991c190792fe4c86
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://coomargroup.com/ckfinder/userfiles/files/neloze.pdf In PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/labomiv.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f24ddc74c---38296183565.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/kakokosetilosafatalir.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/vasufapakuzopowatedoneten.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/11258901490.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210912025932.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/damepazizixupaji.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/46a625da82eee2f6ebd40c7d0fd26212/62418958217.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/wujagojuguvegogadowa.pdfIn PDF document text
    • https://preciseenergygroup.com/media/wezeziwazi.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/92701687709.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/zopavevemomadabowozinises.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/sawigosun.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/68195492589.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/34013365909.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/xovojutejufos.pdfIn PDF document text
    • http://gptools.net/userfiles/file/kojuwipafiniraz.pdfIn PDF document text
    • http://paradoxine.com/upload/files/pabulugi.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210901081705_117819765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=good+news+bible+offline+apk+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_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 17744 bytes
SHA-256: b1188bdb78bb6ff791953473ad2f03dde57a3e6d21aa3c7245588edaff99b5e3
font_01_sfnt_off00011055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001286c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286C 10652 bytes
SHA-256: 2777e10e4d4f1f909243900b6c1eaffab371a9a2c288e52c6e804bde3b18670c

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