Malicious PDF — malware analysis report

Static analysis result for SHA-256 56efabf0f7eea6b5…

MALICIOUS

PDF

70.8 KB Created: 2021-09-20 02:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c421eb9df394ac64481e447bded1a010 SHA-1: fc101a54f3e0159927272757d4dd2d3ec3b4c5bc SHA-256: 56efabf0f7eea6b5f3dd46ba8f72d7f15f9e73978e648b232c42a309d71544a1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript 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 distributing further malware. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://tlumacz-bialystok.pl/pliki/file/lugoxonor.pdf
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/waxegaxixeba.pdf
    • http://bodybybodyology.com/ckfinder/userfiles/files/turipikeruwekogux.pdf
    • http://dytac.hk/userfiles/37157279382.pdf
    • https://binarbaid.com/public_html/userfiles/file/fumemuwuregibeleguf.pdf
    • http://adimhukuk.com/resimler/files/78624867756.pdf
    • https://globalcircle.club/userfiles/file/88415157379.pdf
    • http://mlsconsulting.net/cms/files/File/mufarilupobo.pdf
    • http://vonschickenconcord.com/uploads/files/70361596627.pdf
    • https://uslugiinzynierskie.com/eurostyl/photos/file/lugeditalogesotelanur.pdf
    • http://gazduire-domeniu.com/UserFiles/file/saxofuvifukixibuxi.pdf
    • http://dalaichau.com/files/pojamixifuwufurebarevuga.pdf
    • http://nwatchonline.org/userfiles/file/taruvaxejorak.pdf
    • http://shopgraeagle.com/ckeditor/uploads/files/sufuvikuz.pdf
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/44688683267.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5b026d0c8---6846906274.pdf
    • https://tiemhoamo.com/data/dulieu/files/zabozuvibaluraxudukixaroz.pdf
    • https://listapp.in/ci/userfiles/files/metetuxetiburawilusu.pdf
    • https://zlato-stribro-investice.com/upload/files/46183586483.pdf
    • http://sntaviator.ru/ckfinder/userfiles/files/26440734683.pdf
    • https://essaidafm.com/uploads/FCK_files/file/18038038784.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=goozy+game+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b530.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB530 16792 bytes
font_01_sfnt_off0000cd42.bin
cf1a0c176c7994f220c2187b4e7125753d119a256ffc274a68c357c7a484344d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD42 16216 bytes
font_02_sfnt_off0000f713.bin
ad02da053376d70cc2ace38b8bd482a10b31b73dd1eba2e0d7f1fa0e5073b218		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 10296 bytes

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