Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5e61e8d9a24828…

MALICIOUS

PDF

84.9 KB Created: 2021-09-20 23:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e2a07114b5250090344416e88e8c0f09 SHA-1: 25e25641687475df785418b1855a6f16c13f19b6 SHA-256: 9d5e61e8d9a248287c776d6d3a6e4b6613b82a75fdb5a563d842ce660db28e96
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the structure and URL distribution point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bigdoughpizza.com/uploads/files/13159206041.pdf In PDF document text
    • https://rajatotogroup3.com/contents/files/nidosena.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/80116444092.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/40041194172.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/24034403168.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/13107964500.pdfIn PDF document text
    • https://csodamalom.hu/files/files/97090775495.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/nepaz.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/desewakazigexud.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090820233441.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/vokugusukugefa.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/724758290.pdfIn PDF document text
    • http://krzeptowski.pl/file/30358288848.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433f74d4f82---30583788885.pdfIn PDF document text
    • https://gencatakan.com/upload/file/12096736530.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/7543716704.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/18197305571.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/33348978646.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/nupibesevugogowuvupujo.pdfIn PDF document text
    • https://arendic.cl/files/givazu.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210908044644.pdfIn PDF document text
    • http://zuche0551.com/upload/file/dokazoduvagileb.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/zujitimevi.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/efb2b20d325f67dd1176d3b08dd9eb2d/garufazed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fundamentals+of+android+app+developmentPDF 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_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 10804 bytes
SHA-256: bf551a01a5d0db7eb44badb73a291478805aeea2e04838dbae194aa9f19716e5
font_01_sfnt_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 17624 bytes
SHA-256: b2206d27ba5c3055fca28e19bdbb91fa8f909443faaaea290732639ae84034bb
font_02_sfnt_off00012d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1