Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9add61f4583bb1…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 01:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3021d4d29d57a84c559f48b0c985010a SHA-1: 75d933a2c91bb8de071b2b8b07c4bcaa840b7444 SHA-256: 4b9add61f4583bb12a297877dd6e64ca39e503760faf43e95e6650b951871456
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or phish for information. While no scripts were directly extracted, the presence of numerous external URLs, many pointing to PDF files on potentially untrusted domains, supports the conclusion that this document acts as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://advance-pack.com/editor_upload/file/pimemitigujutujime.pdf In PDF document text
    • http://p-jtech.com/userData/board/file/41818424267.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/silezevopus.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc382e42c---gitosumebijijajogipobenim.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/zuverewulezatelutapo.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/16251263397.pdfIn PDF document text
    • http://metzlerranch.com/userimages/lijupijavosononufasogupa.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/30023733457.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/sebujovagawewubezebega.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zamasodexibafimas.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/11314002684.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/22971683054.pdfIn PDF document text
    • https://akconta.com/uploads/files/juwozakefejemewobalepof.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/49844749044.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/mobuxevativemefavozeburu.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/nudowasoxerubuxurasowonu.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/53466315349.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/pasalarijebeti.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/21403125380.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/galadi.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/58318096010.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/77902805364.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/nogebazifolemikoruzutijin.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/80270883138.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c238edfdca8db3cf146a0a51aff28ed0/45653902706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=wizarding+world+apk+downloadPDF 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_off0000de1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1F 10400 bytes
SHA-256: 3bd67e6975e4d730a738e19de17da4e0c23121002acff1beceb05700ea6bfc7e
font_01_sfnt_off0000f591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 18296 bytes
SHA-256: 8ea53a8c99aefdb9e6f8b614e6d03d71c28af9fd9a04916661648f85a38604ed