Malicious PDF — malware analysis report

Static analysis result for SHA-256 46415295149f70e2…

MALICIOUS

PDF

81.0 KB Created: 2021-10-13 11:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2456d20aa1ecfe4ba2c372fb8eeaa0b3 SHA-1: a3d7a7af5ce6f1a0b12639379ee5b00f2755258d SHA-256: 46415295149f70e2bc600e93bd2889e12db0ead4865075b8d11cd20430b7a2b4
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to other PDF files, suggesting a link farm designed to redirect users to potentially malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://patriabrno.cz/userfiles/files/28591264961.pdf In PDF document text
    • http://mama-care.com/UserFiles/file/magejuvumokobajirevi.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/15222926211.pdfIn PDF document text
    • http://status.cz/UserFiles/File/37902237225.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/81972151408.pdfIn PDF document text
    • http://riviera.az/userfiles/file/35089306612.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/5004701617.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/27064693944.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/pifoviso.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/46514317014.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/7353891446.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/9a04a5480b6c2d1a3a2a043e54c1e685/92336256190.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/bubupaponevaru.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/nodoluluvuk.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/90120127174.pdfIn PDF document text
    • http://taborgospelassembly.com/userfiles/file/gikavi.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/1650353453.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/narukefozulokivoperowofi.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/69227899291.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/25976302540.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/muwodikegaduzajositizum.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/82940359615.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/63918659582.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/pepop.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/81735043400.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413af7eb659---57270305228.pdfIn PDF document text
    • http://belloverde.net/emailer/file/4666213436.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/UsNeCLCzgYg/uplcv?utm_term=age+of+ultron+movie+download+in+tamilPDF 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_off0000d09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09B 10764 bytes
SHA-256: b3e434b93b1c698468f0e4397b14be6a523111c0dfdff3880ad6e21311d5eae5
font_01_sfnt_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 20520 bytes
SHA-256: 7d10004331fc42bd369064049966cf6da43d72947cffecf4872cc3c1a9d90138
font_02_sfnt_off00011d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1