Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5257e324227225d…

MALICIOUS

PDF

77.4 KB Created: 2021-09-30 11:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ca8bc5017bc9e9c259b98880d620cfc SHA-1: 0c7e60d152ea7ebfbe49b60e88c37cb1cd0bff01 SHA-256: a5257e324227225dd65f7720c5958bd8e56858a42ba882b36ffdb9bed00f8710
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://jetaime-shop.com/files/waxoxomukotu.pdf In PDF document text
    • http://makinsushi.com/uploads/files/17962270580.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/janinudovifawexobisuze.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/papukexefivawaxopatok.pdfIn PDF document text
    • https://grnca.org/img/files/files/xewawunaxuriwepifoniruk.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/36731053270.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/71210285791.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/22631922493.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/37895041524.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/mozitopoje.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/46328138215.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210927160947.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16151f82bb4676---20807076667.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/jenutemas.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/55225032782.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/xatilabapadelado.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/kobexafi.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/12699683159.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/41580286342.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/21998006067.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/rovor.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/gupaburubesag.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/8cvhf3eta1qlg8k3cqrlkfvmck/dukew.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/36924775942.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/88171452925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tom+and+jerry+race+moviePDF 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_off0000c33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33F 20048 bytes
SHA-256: 89d4a6aea08bcf1fca8d24197e9d5e7c2050a80bcecff47e92af06eb10605ac7
font_01_sfnt_off0000f7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D5 10492 bytes
SHA-256: 804ddfc966387ea5b2a446921874efc348c0f8da88fd3e5438cce6d9e7b5616d
font_02_sfnt_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1