Malicious PDF — malware analysis report

Static analysis result for SHA-256 70db697ca1da8763…

MALICIOUS

PDF

89.5 KB Created: 2021-09-07 04:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2f27012de2a79c83536dc5bc6186bb80 SHA-1: e035ffdb917bda57f5f777a828ca37be4b2b224f SHA-256: 70db697ca1da8763f3a232535b661a0bd3b4196d8c5f839e9b97b507319cde7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. This suggests the document is designed to lure users to potentially malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=css3+layout+pdf PDF link annotation
    • http://lanaecoloridabruzzo.it/userfiles/file/jukagazirawudizewamaketu.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/58290737036.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/76499086702.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/gutokolebax.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/96825100486.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/xiniva.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/zipukibinuw.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/bipomonemexefu.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c957654fddc---pubupifuba.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/qir1gnhdlqd4t347pt6mjspkhd/20201774899.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/42957746316.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/nipuzarunagu.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/94500948742.pdfIn PDF document text
    • http://novichiha.ru/pic/file/80670761269.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/nigusukovilibavesumax.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/8980715952.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/2962077589.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/51751886924.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/92374022467.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/13046581424.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/22718051140.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/80001333384.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-26/20210726005412159197.pdfIn PDF document text
    • 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_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 17448 bytes
SHA-256: ca2d9321f378e4302669e07837d422b5c928ee9b51989e8f06c764e9eb638196
font_01_sfnt_off0001287e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287E 10480 bytes
SHA-256: 9572e01e19d2d75a6e797aef55363842832dbbe39734dfc5fad707d1279025c9
font_02_sfnt_off00014093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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