Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab197ece24358b7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 04:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c6401273c33dad62cb311a75b6295076 SHA-1: 061a9d337c898b53f885e078759572169111946c SHA-256: 5ab197ece24358b7089738657ff927d9d79599beab9c1e5757be8c9d012624af
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially malicious or unknown domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://zibarajabi.com/cache/fck_files/file/kisuveruvavakoj.pdf In PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/remudozowu.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/74892474807.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/xitujarevox.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/towezatufifugixot.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/nagix.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/91030478251.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/99635836187.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/wumenotilapuzasoxevovofo.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6eaa128c9ef4f1af949e30e6521a89c4/31376651695.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210919075344.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/81629564251.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/bowotelixudine.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/wawezerefikemafi.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/zosogovekevegepuj.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/fuletuz.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/77241070659.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/jaxotumebojozol.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/jerufopimese.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/kalalorikepusimumaxukek.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/36751255164.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210917_B4DD3C00EBCA38CD.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/53530303477.pdfIn PDF document text
    • https://vitanov.rs/files/6076943071.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d3ee78f1bc5890db43ba41f82d133508/50608203271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=bible+study+for+unbelievers+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/rufusuralofoku.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_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 18408 bytes
SHA-256: 92323ccff733116d35616eb33b37a3260812161e13e8597495705aca31443801
font_01_sfnt_off00010c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 10804 bytes
SHA-256: cf8bb958189ac98f1549258e4f842d69ab51f1d0ca27fc83654773a24d59d34e
font_02_sfnt_off0001256a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1