Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4bbcf21ac907e7c…

MALICIOUS

PDF

74.1 KB Created: 2021-09-19 08:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: baabd2c187eeba8092254fc3d64b8dfa SHA-1: e5d4207bb7e1c70d67b878e84a970b3d7a2406e4 SHA-256: e4bbcf21ac907e7c35112bffd883edd581b211ffdebc295567f0945fa2d75f93
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://padservhosting.com/userfiles/file/72834806794.pdf In PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/55552043408.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/4707456835.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/jovedi.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/jakite.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/70856569068.pdfIn PDF document text
    • http://rcot.org/userfiles/file/guwukedujilunapaj.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/bakide.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/misod.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/lesorojowufaj.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/semowebafibibajinirejez.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///xelig.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/11388467167.pdfIn PDF document text
    • https://mikludava.lt/images/files/vupadufube.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/gasimumotupuw.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/16152137772.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/62738946589.pdfIn PDF document text
    • http://banquat.com/userfiles/files/zovuradololup.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/ruzurojur.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/51543705406.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/negukazugulapukixamo.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/xovuzurobu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/16b39cd3c906196e5faac80f21fd390b/43810737173.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/ludesemulatelozex.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/90396247397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=combustion+of+cyclohexene+equationPDF 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_off0000b852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB852 18508 bytes
SHA-256: 14da6107cbfa9277ae40d9e661101aea5ff997e272a6d0fb6a36c16b5356f222
font_01_sfnt_off0000e8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 11136 bytes
SHA-256: 25e7e990d03bb5cfc1d3646a2ad39222ac0ccda67cdb12e4c49fa3655d4681a7