Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c05ac4f2974099…

MALICIOUS

PDF

82.0 KB Created: 2021-10-08 17:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 875c176c856aa71b57429e525849872b SHA-1: 8964aa86a9d55ce29efc23fbeb59d89cf705020f SHA-256: 93c05ac4f29740998af100279c2b96fe1a71f73282f25abe4b2d6c6b4950b7d1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript and numerous external URIs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates that the document is part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://mediedil.eu/userfiles/files/furefoxowab.pdf In PDF document text
    • http://tulga.ru/editor/files/fafuxujulinazelip.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/marodamamodoj.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/jojudijalij.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/9b76908c8678c1bf26804a6f9538dfa3/20781733178.pdfIn PDF document text
    • http://lactopad.com/uploads/files/setuxepevedil.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210913021457.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/16604899601.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/judogibo.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/44618789939.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/32538647784.pdfIn PDF document text
    • https://priscar.com/documents/files/91600156460.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ert24qhm0gh98fdbia8c8n7mfg/rasaluvegajativedafakam.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/rakenosiziluxorir.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/98760939480.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/55416306551.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/wugijoneberolikugurug.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/dawud.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/1653301924.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/74408662372.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/popimoziweg.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/67821492138.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/11928650859.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/gobabulebafoni.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/28524448664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=funny+things+to+do+in+an+elevatorPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/76055459784.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_off0000d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 10784 bytes
SHA-256: a86be9e39cd8f9dea38ce744711a276aafa4095c031f1be6ed33f966d83e76a3
font_02_sfnt_off0001091a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091A 19236 bytes
SHA-256: 6d3ed9738dc3cdd34c66aae966bf677deecc2ecc80c144436bd6b57d02d72f32