Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7dc4365d5c5433d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 23:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6bd8d5b893cee987429ae8c2c066591c SHA-1: 0b9534b37baf52652c3030cf19497d9dfa01d29b SHA-256: b7dc4365d5c5433d09f6b88499551a86f9b26a94d63fe91c7ebcb893ad0409bf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer, likely to facilitate further malicious activity such as downloading additional payloads or redirecting the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=thunder+iptv+apk PDF link annotation
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/lumisabififad.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130546599cea---numusare.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/jidujenopilanuxobu.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/jitifujexijenako.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/4cac0329c0cce028c47a8762898d902b/wifagul.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/27241910031.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/58720946301.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/21100179279.pdfIn PDF document text
    • http://winso.tw/userfiles/file/fuzenazogovirazoj.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/68220145718.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/nakoxafigupuzisudo.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/nodavilonoxugunuwujevi.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/92771292930.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/15489603094.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/63752007337.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/wajeponi.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/26760751146.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/29184349438.pdfIn PDF document text
    • http://newchat.xyz/js/ckfinder/userfiles/files/gewalub.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/18834687308.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/22609171817.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/mikave.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/31041265207.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/ladulexogixusosisugaze.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/37232958712.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_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 18056 bytes
SHA-256: 8a4e9386dc0114bf0dce3f5da956a8ca0bfe21198a5a75d356ddb7977403dc1c
font_01_sfnt_off000112bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BC 10376 bytes
SHA-256: 77e40fffce24fbbc7cb315343e5d084f9e788ed2fb1e95e967a27f9505ae2b9c
font_02_sfnt_off00012a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1