Malicious PDF — malware analysis report

Static analysis result for SHA-256 2805943ad44829c9…

MALICIOUS

PDF

65.0 KB Created: 2021-10-02 23:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 96a751cb3c2e438f3ddc17933fca446c SHA-1: 41b68880c6786c28ea385cae07f808f1faa51ac4 SHA-256: 2805943ad44829c97900729f74243408fd9adf80130e4bcfdccbb66248184f5f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were extracted, the presence of many embedded URLs points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6095

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 https://pbpkrosno.com/fckfile/720766770.pdf In PDF document text
    • http://asbu.net/uploads/FCK_files/file/venanosimemorewefil.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/7894106242.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/bojedefupene.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/84139748990.pdfIn PDF document text
    • http://tiquital.com/documentos/file/gelivi.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/74405970350.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/20709416176.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/28298010128.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/warekovawesino.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/22e8717088b4ea5a293a5eabe50e2cb6/57711304889.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/38164446267.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/29494644604.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/tevefovozezalanex.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/juxixizijaditibirab.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-03/2109032045302426182rg5octex8hc.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-13/20210913125005504631.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/81700323550.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/17072922696.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe9854e281---jajonosuluduxolobexokiw.pdfIn PDF document text
    • https://manenshop.com/upload/files/86926211019.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/63057080965.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/vuvenefugegobiwana.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/karipitiwamabox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=compaction+test+lab+reportPDF link annotation
    • 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_off0000b31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31E 14844 bytes
SHA-256: 039bb0a48e19942eac740d1883996389302baec723f291a825fb3cb2fed95c35
font_01_sfnt_off0000d858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 10708 bytes
SHA-256: e01b1980559d8151867fcfdfec270f4d013fddf9fc225b307192c89c7fe03b01

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