Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebcd42a21b33d168…

MALICIOUS

PDF

73.4 KB Created: 2021-09-29 04:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: be3f9d2ac295d6d49edcffb893282491 SHA-1: 976ed2fd78ce62000fed3cf59e5107755208d943 SHA-256: ebcd42a21b33d168b225d3cb851afeac131c4ecfd1c1fa0fb2d9a1e695d471a8
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. The PDF contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7417

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://irlanc.ru/uplcv?utm_term=how+can+i+facetime+on+my+computer PDF link annotation
    • https://feng-shuiworld.com/userfiles/file/76412257821.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/dubuzenejemeguwi.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/48242380444.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/siterituk.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/71018274963.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/nebixidolub.pdfIn PDF document text
    • http://cartopack.be/Images/file/88353152898.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/lowodovubon.pdfIn PDF document text
    • http://julianina.dk/upload/file/80152104549.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/badelifu.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/12808903446.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/bolupofivir.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/78605866440.pdfIn PDF document text
    • https://ijpdua.com/contents/files/72977579785.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/6041644075.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/vaxupenizovufes.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/xarebanonawoxujuwoje.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/kosaxudedetamajeliw.pdfIn PDF document text
    • https://noventa.cz/media/files/file/39467593563.pdfIn PDF document text
    • https://redac.ch/upload/13344952280.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/70001693366.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbbc0578c5---gawijebivojiz.pdfIn PDF document text
    • https://rajaunited.com/contents/files/46488402318.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210905/file/7711926095.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/sumisotuzetilego.pdfIn 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_off0000c1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA08 10716 bytes
SHA-256: 6b778390487833d018b3bd0fc149ffaf236441dec51df9df2a8128a866f54d03
font_02_sfnt_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 18588 bytes
SHA-256: fe047ee61d193c47c9282582392e82760c6457ade4de8d174408306678dc1998

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