Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa49e774c7f9e17d…

MALICIOUS

PDF

86.5 KB Created: 2021-09-22 23:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ce9ae6e314578f8ed757682c21b7cd4 SHA-1: 860772448488cd2f3184e6e174e37291cdf2b0b7 SHA-256: aa49e774c7f9e17df3770ba18d0901ebd4690c89fca450e00ba39b04139b53e1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files hosted on distinct domains. The presence of many unknown reputation URLs suggests a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://best-label.com/upload/files/solomisule.pdf In PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136093b38072---menitemosorezibegelirasu.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/pedunovexawiges.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/movevozuwotatofonif.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/xufewifel.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/4e8c91b0e2e22a59606035dadc33af68/berijidoni.pdfIn PDF document text
    • http://www.buildonhope.org/file/fitinesunejam.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/welobadokuxokam.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/soxog.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/31934570143.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210908_03546B1ED95042CE.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/98291283636.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/judarujaruno.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/bexasakiviwagunuzeta.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/bexasa.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/jamusepelenejepe.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/wabevozira.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210902105013.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210919233008.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/70312370190.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/xorumenexelitiwane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+escape+game+androidPDF 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_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 10864 bytes
SHA-256: 5255521c420b0e8465a46851a609d09eccdde63087516b156b9e43841283d633
font_01_sfnt_off0001080b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001201d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201D 17172 bytes
SHA-256: 39b761fc982809671be80f91bc03eba78964c61e3e3ae2299756f259d91af19a

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