Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea142b0927393ffb…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 12:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 36523bdee2a8a9035ef38f0cb2e6f478 SHA-1: 368bdd453b63f03c507dcacac8fd44d44967e47e SHA-256: ea142b0927393ffb858a1a7182b3142f05d9a8d0a8a5671d20bd2011ebc23936
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The PDF contains numerous embedded URLs, many of which point to distinct domains, suggesting a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and the presence of many external URIs are indicative of phishing or redirection tactics, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://aimhc.com/userfiles/file/ziruvivawinon.pdf In PDF document text
    • https://vietrocknet.org/app/webroot/img/files/79013148450.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/bedak.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/85529923666.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/10454677836.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/bufikusuxumunabed.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/29328540868.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/dopesanerifiwefajirakipi.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/66348502228.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/40844651386.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161349f5b43028---85253060434.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/89529161560.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/jizusafukumepanibofenaje.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/953707787.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/sejoda.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/97878652676.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/rozonurefudupegugi.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/tafezimamenamune.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/pobakalulegemazunuvosufuf.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/40526903957.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/46199214160.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/josevudizisaramepozezuke.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/67760546529.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/zelitanidodotunav.pdfIn PDF document text
    • http://nscenter.cn/upload/files/28085256798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=kannada+novels+online+reading+freePDF 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_off0000d92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92D 17348 bytes
SHA-256: e5e90ba1b69632e65d961f64cd055e8c74390b02376a0447fac749b63e0c4342
font_01_sfnt_off000105da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF1 10488 bytes
SHA-256: d06906c9d3d370197a81de77a3cb2aacf0eadf57e35dce9206233d9dce565de9

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