Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fad3d674f143279…

MALICIOUS

PDF

73.0 KB Created: 2021-09-17 12:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0775d77e0929b7e931ec15a53599a8bb SHA-1: 91ea843c78b2d00a997bc6cfe9ed179f3a462fae SHA-256: 9fad3d674f143279fd98b5d2bd2e5a0dc30e8482248666ab6d86d284fd1fe3f6
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to link farms, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cokhilegia.com/upload/files/55257459436.pdf In PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/86296569371.pdfIn PDF document text
    • https://coil.hk/upload/files/xefojediwa.pdfIn PDF document text
    • https://theurbanthinktank.com/files/28633538141.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/81104099983.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161323f5f8f25e---60266509540.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/sobixujufunuroberitodirib.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/liromobukabubelitosema.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/dcu6o92oe1iuv4ua8qsenv2qah/30188469993.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/zuranorediludidololi.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/tesudumowodusu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/77360330182.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/xadunon.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/26329818989.pdfIn PDF document text
    • http://chinalabware.ru/d/files/pewisowazodasomufata.pdfIn PDF document text
    • https://fishboat.hr/files/75078731139.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/63470614573.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/xevugevuvexinuxu.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/84029636077.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/10905832191.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/xakul.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/jekodi.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/98942764787.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/bopowuxupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=premam+tamil+dubbed+movie+download+tamilgunPDF 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_off0000b69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69F 10816 bytes
SHA-256: d2b52bab8c104a4f5252e75435508914266a418fcdde681bdc2af68007ee3f74
font_01_sfnt_off0000cf5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 17332 bytes
SHA-256: b0640a7b7e5aa002ce7f8a6c334698974a9cff1b041af4c9989b0860d0ae987b