Malicious PDF — malware analysis report

Static analysis result for SHA-256 676d66c4f915d335…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 10:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3dd08320553e657c4084c4b750ab6e92 SHA-1: 7c0c495721fce3efbd9d7e0667831fd111a2caec SHA-256: 676d66c4f915d3354f50b0775899c5ab460444fe4d35371f7c07dc1e2a9e140a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bhk-aindling.com/userfiles/files/7973236626.pdf In PDF document text
    • http://joesservicecenternj.com/userfiles/files/71376248482.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/nigovidebenoto.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/vuxepo.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/86320198497.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/60072123096.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/44161356855.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/fopeposukeped.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161398d2db5505---nesojupofomu.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/99658941086.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/jukavig.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/baxivekojame.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/luxifula.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/xuwobilex.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/mijumesarupebifolot.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/12719706143.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/uv1t3l0m8qqg08r3i8e9klgqn7/20982247768.pdfIn PDF document text
    • http://amatnieks.lv/pictures/image/besubem.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/1461148909.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/liwegigo.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/bokesitefezafi.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/dapolobogijivoxewarobuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+use+jioswitch+appPDF 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_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 10528 bytes
SHA-256: d9082b6aa550f13edaecb788d3d046f7e7bb06913264bdb555d6562b5a358667
font_01_sfnt_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 17596 bytes
SHA-256: 17d5478fc634110deea4fff8fcff6b5e9d9055ed886a3b909438936ba0cae634
font_02_sfnt_off000122d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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