Malicious PDF — malware analysis report

Static analysis result for SHA-256 f366ccd77bd31f7a…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 07:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 76c1449fc94f5b468743e69004bae0ee SHA-1: 7c94675cfc934746210fabe8a65236c14f244b83 SHA-256: f366ccd77bd31f7ac4e1caf3bafa1e14944c9e5c55dbcdfaffe2342a5fc715a2
146 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a clickable action, typical for directing users to external URLs. Numerous embedded URLs were found, suggesting a link farm or redirection mechanism to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://idealist.ro/userfiles/file/65584746900.pdf In PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/53672228874.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/92382256789.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/44439455178.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613074e732a9c---90453656082.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/metetuxetiburawilusu.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/mimuwakakoz.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/99106136581.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/95720998816.pdfIn PDF document text
    • https://h016s5or78-du3.com/contents/files/88922347096.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210914072820.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/c16ovdi0buekd0kvbin47grco7/gugoputevatiwab.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/duwixo.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/97235249660.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/totalaxagipotolo.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/4923995331.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/74903069473.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/35952159575.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/puvezo.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/nizoxepim.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109190443232997.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/29403841502.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/11966518464.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/punukelo.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/7753537342.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/lawadigaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=windows+10+aio+download+64+bitPDF 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_off0000b09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B1 10648 bytes
SHA-256: 522a3dc2dd43680a574dff7d2d0483a1bcc5c9df5c0943c4299b8f449a1abfe5
font_02_sfnt_off0000e148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 14364 bytes
SHA-256: 853eb6cc68a2ff371be1069536b8864b848fd73cc451ef734fab1ff794a8013d