Malicious PDF — malware analysis report

Static analysis result for SHA-256 d578a147b1690b51…

MALICIOUS

PDF

71.6 KB Created: 2021-09-29 13:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 77397af292842499c07640dda5d65edd SHA-1: d21b215777f9867ed11331f4b789a48e5b139ddc SHA-256: d578a147b1690b51c80335ffc9254e6ef6305b0a2aa1b9e545b3c68736c0f05a
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 hosted on disposable domains and appear to be part of a link farm. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://crewmak.ru/uplcv?utm_term=kodi+19+builds+android PDF link annotation
    • https://mamap.in/ci/userfiles/files/9058831105.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/25085765005.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/kizawekaxokujofabizelal.pdfIn PDF document text
    • https://kenadong.com/contents/files/forejadolesabosegudi.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/77314557980.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210905153258.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/78910315878.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/lolerupaniz.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210912015444.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/43525281596.pdfIn PDF document text
    • https://ayurmitra.com/files/file/77562676941.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/34422425532.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/8436411842.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/71446791173.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/88127183811.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/38512832803.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/57262867865.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/wigizalumuzumumor.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/6961576497.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/53780707273.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/870a4c2eb4e7dc1e0db7e3d84a9832bd/besebukuwanitedujosovuzas.pdfIn PDF document text
    • http://indemo.pl/Image/files/duzimerifepesekavemawotoz.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/32945637236.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/42218997455.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144475e0e257---bigaba.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_off0000b300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB300 10460 bytes
SHA-256: c05bfb64405b95ae3098e30501e4a4dbfc07a38ea140281906280789ce0f9135
font_01_sfnt_off0000cad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD2 17196 bytes
SHA-256: a3c05c8aa85ce04534f722b1549cde1b195e2ed42ef7941cc68687f279b6becd
font_02_sfnt_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1