Malicious PDF — malware analysis report

Static analysis result for SHA-256 3869046f033c2e91…

MALICIOUS

PDF

78.6 KB Created: 2021-09-29 02:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d60a83621e4671f3bb657274cbb52123 SHA-1: 7af2388f1e66fdbe290037acfaf874e76a630f16 SHA-256: 3869046f033c2e9133fd9eb84264e53a8951cd1e87077cbf92558445990991e2
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 domains that appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://sunriseinnjasper.com/nbloom/fckuploads/file/49767590294.pdf In PDF document text
    • https://e-uchebnici.com/img/file/vewabitijadowanaveze.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/63267606262.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/19078300471.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/pezukibafexakotifuvoj.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/xovubenukujepapepupopuxu.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/79977624485.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210919093013.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/93312674513.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/56283834973.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8d2399575---negope.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/nazilenoxasagapedinajabew.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/vurusisozuw.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/joderezowajobekoxirivak.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/30975626508.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/62641803137.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/86891669972.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/xepemizenodej.pdfIn PDF document text
    • http://e-sheremet.com/img/78675708892.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/61994042509.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/dezofalitobit.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/supogojobewil.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48213165129.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/sugefowod.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/ziwiwajudaperis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=mod+apk+hill+climb+racing+kindle+firePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CB 18768 bytes
SHA-256: 65fa6a064bbe656682c6fcb9d4ace11a2d97a6d2272d5ef4a282e0ec2e51cdc7
font_01_sfnt_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34
font_03_sfnt_off000112f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F8 11024 bytes
SHA-256: 0cac59fb779f77058b89355e01c3f2d862d6844432e5a1f08573a2c4863f882a