Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28b75290c4b2b08…

MALICIOUS

PDF

69.3 KB Created: 2021-09-20 06:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4f230c349569fa35c8908d84a791988 SHA-1: e57029b90124601f022d1119de75eb45c6eec56e SHA-256: f28b75290c4b2b08496763d22f6be48bd4a1a709d370c43e758ed08b7512b5a5
94 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, containing numerous links to disposable PDF hosting sites, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate the redirection to these external links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3555

Heuristics 4

  • 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
  • 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://macierz-grodziec.org/files/file/21704499910.pdf In PDF document text
    • http://folientastaturen.pl/_data/file/tuvusoraramugos.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/85411894847.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/163170691380126189.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/31846428472.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/poditogaguroniwa.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/89647558538.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/xutofivewujatufar.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/sedip.pdfIn PDF document text
    • http://entrackintl.com/uploads/71471817102.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/nenemixokivofok.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/pesulironuzemi.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/fogujupobibakuxixi.pdfIn PDF document text
    • http://space-edge.com/upload/files/dupawusu.pdfIn PDF document text
    • http://eichler-kammerer.de/43709816628.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462d6968fd0---80904542451.pdfIn PDF document text
    • http://prestopc.it/upload/file/wuzidajapivewokofa.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/gemet.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/9971041283.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/jebesusoler.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/jiwez.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/liwazitojekej.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/26836292430.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/32179613954.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/56097458665.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210915202059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sd+card+recovery+software+for+android+mobile+free+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 11120 bytes
SHA-256: 37f34d3b962b823e494471047ae571c42209c22da1f2f9b8f22199c8ae9167b2

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