Malicious PDF — malware analysis report

Static analysis result for SHA-256 30434c395b0c0a29…

MALICIOUS

PDF

77.7 KB Created: 2021-09-11 17:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 7e70e50d43fc74fe655a22c873202a6b SHA-1: f66b299f3f7ad626bb638214af30d9d047ba6553 SHA-256: 30434c395b0c0a29fedbfa467ef27f072140e579a3f0973932b6f83eb7a7271b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://thayloilocnuoctaihanoi.net/upload/files/18377011417.pdf In PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/84671245917.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/92145823882.pdfIn PDF document text
    • http://carszana.com/image/upload/File/95715886045.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/nakogaganenoxosoluw.pdfIn PDF document text
    • https://harom.ro/files/file/22170825868.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/11129541631.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/furoxilozupisaja.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/kukitomodenopekix.pdfIn PDF document text
    • http://abwrva.com/uploads/files/87496413518.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/40232058522.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/66772643874.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/dubaxoxonebekafasufezow.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/fusutapuwopesop.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gajopujosuturotuwe.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/47790404908.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/36773158164.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/mifumupovosaxedujibo.pdfIn PDF document text
    • http://grotech.in/userfiles/file/maxitat.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/4941284827.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/60258849938.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/fufegifiguligox.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/mofiniled.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+cinema+to+firestickPDF 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_off0000c943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15A 10816 bytes
SHA-256: 0daead160798cf9ec06818b3552ee63fefc4ed84f5693b796a228e43e935b242
font_02_sfnt_off0000fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 18236 bytes
SHA-256: 59f19af1423a0575dbda80a9d8a12c1cc964237cad56f88c65a4db7120a0e6c6

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