Malicious PDF — malware analysis report

Static analysis result for SHA-256 efeb52f301597a05…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 05:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 234d85ad95586f4b54e26fdc05b47acd SHA-1: 23db636f383e373029a26922dd155f1872f35227 SHA-256: efeb52f301597a05213931dc12aff466d7cddea3d4f8dd9f5c682ae48a24bdb9
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are embedded within a link farm structure on disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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://catamma.ru/uplcv?utm_term=famous+male+beach+volleyball+players PDF link annotation
    • http://www.louisianarebarcontractor.com/editorimg/file/jadazedonivem.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/nanasadakurirosebetugetol.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/sorelagaguwak.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/wuzebavapalurudimojamajo.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/46460663275.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/tevodiragopinoworubozala.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/39942146399.pdfIn PDF document text
    • http://kids-ex.com/images/blog/file/nisinonivadipiniganezizi.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/vurivosixifiwupef.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/sutodax.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/kiwoxopobodaxugovaruki.pdfIn PDF document text
    • http://songchanraccomposite.com/upload/files/67656829186.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/9015826427.pdfIn PDF document text
    • https://synersys.fr/contenu/file/63028731302.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/71066828192.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/56605859980.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee8cc8ac0d---48886953351.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/32469775982.pdfIn PDF document text
    • http://twilaw.com/files/files/19266536580.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/20313417064.pdfIn PDF document text
    • https://rippa.pt/files/file/26675401326.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/lifijazetitewadoponiworo.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/badibivarusowufodutug.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_off0000af86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF86 10740 bytes
SHA-256: 6808085e40bf08887683357f3e29385731761a30523ac709c632cf8452227821
font_01_sfnt_off0000c80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01F 16940 bytes
SHA-256: 6c605681c8ef05c7db9878bd061f9911787989aac0293e82f7a5ce2450bbb01e

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