Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f99129351d7d3cb…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 02:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bfdd889eb023ac9bc2025c38e55f4c18 SHA-1: 028fde32a2e1f53a28289d6616a602aa0a0659b8 SHA-256: 1f99129351d7d3cba236378e0851c889c3ba9ad0bd24187f44e85a16846f38b3
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous links to external URLs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious URLs, potentially leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=6th+std+maths+textbook PDF link annotation
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecfa8b4e92---peragozexafi.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/dumisisabinufapibilezur.pdfIn PDF document text
    • http://boki.hu/editor_up/15397289444.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/gisepomuzu.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/13143006424.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/towonodaresekolo.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/82239028130.pdfIn PDF document text
    • http://henca.com/files/details/file/35247426571.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/8498521920.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/29779249535.pdfIn PDF document text
    • https://sergiomauri.com/images/file/likokexeje.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/ketapumurow.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210912102112145.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210919_C9059B10699A155D.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/lekezatevedose.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/4cb9e59411607003cd164f21b18bda47/dazemivurefukomivijugaj.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/98723507151.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/jejoxugifufo.pdfIn PDF document text
    • https://lazerom.pro/media/file/88013729776.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/vadenodoforigopotedekadu.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/kejazikorizopekapobexal.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/lonuxigakukinegivuwewubaw.pdfIn PDF document text
    • http://machulski.com/public/file/77084430764.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/wenep.pdfIn PDF document text
    • http://fnathservices.com/upload/file/dubexileno.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/613eafbdd89cd.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161423498cd4a8---lebazukokekovod.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/zigedo.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_off0000b7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B1 10576 bytes
SHA-256: 3205ddec561b891368fc58c2d6ca4555af1ae8fc004fc627ef46fec8c3a9f730
font_01_sfnt_off0000cfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE6 15668 bytes
SHA-256: 483042684f7b6cfc66e58141cb3247449d0afa0abf169ca0f42f09e0a76224ac
font_02_sfnt_off0000f7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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