Malicious PDF — malware analysis report

Static analysis result for SHA-256 882d3e4a7de2cbb1…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 19:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f4215cd7362f24e211b5345c494aa557 SHA-1: 4e2b8c988e04573cfa51b67367c8f5ab1eb28d8c SHA-256: 882d3e4a7de2cbb1102ecc9a5d09a312774ac6b51f276fee3c8815d3f76adef7
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious or phishing sites, suggesting a primary goal of redirecting users to compromised or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://eurosan.pl/user_images/file/jirivejexawunerafizawilif.pdf In PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/43019922630.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/detaw.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/gujubewopazapekubupuwev.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/68318985458.pdfIn PDF document text
    • http://robbes.nl/media/files/fubudigobojurugobekitotur.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/43357405048.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/runamivedufole.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/jupojesopawobivafo.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/14608266874.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/dogerizaxuxokejobo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362cae524b8---69775108922.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/zotivalovozojovepepaj.pdfIn PDF document text
    • https://durimawar.com/contents/files/592423762.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/62019623687.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/gopaf.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/mekuvebi.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/32237275751.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/vasusorixanubusene.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/60543287271.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fac8516d5d---relizaput.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/rikasijenesokirolas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=causas+ictericia+neonatal+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_off0000d40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40A 10744 bytes
SHA-256: b532157da5685745b15b60c6ee7c3f303ca80d15998df933f9c6f7608a56490e
font_01_sfnt_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 17952 bytes
SHA-256: c737589974ec640354f0d0bb1e82d79678a402ed61f11fd28defe1c0257ea580
font_02_sfnt_off00011b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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