Malicious PDF — malware analysis report

Static analysis result for SHA-256 984269877131d19c…

MALICIOUS

PDF

73.2 KB Created: 2021-09-11 10:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 6e523b215b71e2594dffe6f73c42a9bf SHA-1: e03eb210d31533a1d630750a8c31a830bc257deb SHA-256: 984269877131d19ca2e0b928cc6aa2a1842058c2dca67fc043635565534f5a93
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://m-astar.com/UserFiles/files/53549595969.pdf In PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/disipo.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/57907699383.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/78759044515.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/14774114662.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/mosijij.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/61597848645.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/wudusalitajofojoxemazamid.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/56845083960.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/13345998604.pdfIn PDF document text
    • http://uco-kampen.com/media/files/14656557825.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/jomexizulekalojimu.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/vagexopupivi.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/jumafafifafajagubutuk.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-11/20b1b470e00e15b4c8401a9b44164c2d.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/xubudone.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/zalon.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/63476036167.pdfIn PDF document text
    • https://digireg.ch/upload/gugejikixas.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/jonevopidisuxajudanor.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/palikawibilokejagebim.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/18306102283.pdfIn PDF document text
    • http://upakuika.com/img/file/padosenebilewuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=present+simple+elementary+exercises+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_off0000bc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC52 10880 bytes
SHA-256: f5b9bd88a1a2994680186478a67fc19b32285ae13efd1885b6717b8dadfe0302
font_01_sfnt_off0000d57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57E 16084 bytes
SHA-256: 31b8ec4f2849b2e0c425b3cbc6711a595f89c497e3cbeed564b383dba222d7fe
font_02_sfnt_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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