Malicious PDF — malware analysis report

Static analysis result for SHA-256 a465a618d7baaf2e…

MALICIOUS

PDF

72.0 KB Created: 2021-10-01 06:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8191332ee06b229e16479736b2ad6449 SHA-1: 59749d3600814f3f8c8e24575bf3e871dc12bdeb SHA-256: a465a618d7baaf2e43e64cd55d2544bb67b05e61d887f04efae09e11d0cfd103
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malicious content or phish for credentials. While no scripts were extracted, the presence of multiple unknown URLs points to a distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://sushikyototogo.com/uploads/files/5054813745.pdf In PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/cd7815ed76b91e18a65defa5c191f0e4/gefek.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nedage.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/2656396495.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/46525715752.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/dowowotolejatem.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161509fd446ff5---giwad.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/61410911753.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/87545741390.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/mebonepamofebekibibajela.pdfIn PDF document text
    • http://esteel.my/userfiles/file/kadizuzazugokiwu.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/65491147973.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/68715026006.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/fojebitupidoronujesojape.pdfIn PDF document text
    • https://felicityokolo.com/file/75622661577.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/35980347536.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/61252448642.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/40931316412.pdfIn PDF document text
    • http://posuni.com/userfiles/file/pawuju.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/7218517513.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/74109512266.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/jawemedatumenivofas.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/72420108737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=raspberry+pi+4+schematic+pdfPDF 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_off0000b44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44A 10992 bytes
SHA-256: 93dedf1ade7f95c07b1cc0ee226f11b356871344e497ddfba0233966065389df
font_01_sfnt_off0000cdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CC 17344 bytes
SHA-256: b861a82f62fc1327fc83e5228bdb5821c10138bce4084206f54045a5413d9429