Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c828c17b07375c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-12 21:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5f0bb3274960237b37dcd5408ab247b4 SHA-1: 80835978a2404d841ac3a49ee9bf34e9af4678db SHA-256: 25c828c17b07375cf2fec5bd5754873931f1a62bea1249966dd01ab0b81ef16c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm, likely intended to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a tactic to obscure malicious destinations through numerous redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://tomboy2.com/images/library/File/66236652210.pdf In PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/46445533916.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/semikovij.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/povekekopukupibo.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/pupuxesedotefafodev.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/kinijifirobomepejon.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/22783267077.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbda539143---35721983134.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/kojutapijumelub.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/mojuminimekubo.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/79649188468.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/15279961591.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/37941491125.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/somamepafok.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/nuwod.pdfIn PDF document text
    • https://webmenuplus.com/images/file/85370313112.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16131bfe27205f---76423908019.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/95476448393.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/supenaxiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+disable+android+autoPDF 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_off0000d04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE865 10560 bytes
SHA-256: 4634a5e07176922291e46cb4a9f7b25ee3ca03df2152ed7fe7e72b732654982c
font_02_sfnt_off00010098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 18664 bytes
SHA-256: cb596123a4dc5987cdc7625dd8b85dc6cbc6bfc598b6ffd24d3ca11a0207267d

Open this report in the interactive analyzer, or submit your own file for analysis.