Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc476133a3926ff3…

MALICIOUS

PDF

75.4 KB Created: 2021-10-12 04:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ba19e697ffff91532aee78a7b9cccb7f SHA-1: bfbbfbf29453f4b84a19a1e8d9e6920bd692e565 SHA-256: dc476133a3926ff3ce438e6bab3b0944d286e52360b166cdb6cc570ff256fae2
124 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with numerous links pointing to various PDF files on distinct domains. The primary attack pattern involves directing users to these external resources, likely for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5411

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://tamtamphat.com/upload/files/39822423525.pdf In PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/84344793454.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/tasedebusawe.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615606e9a8e53---dagenixolojakovoba.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/zilezazos.pdfIn PDF document text
    • https://parkettworld.com/upload/files/devopefax.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/memato.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/kuzaxolegejijavakesobere.pdfIn PDF document text
    • http://placc.info/up_image/xojajuwa.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/wononepixidujo.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/60232566822.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/86085880491.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/xuxusazag.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/96188786821.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/lotolugexusezoluwesej.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/zofefozobejexonosewe.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/fisuxaruzegepo.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/92070137901.pdfIn PDF document text
    • https://nesbedcollege.com/singhania/downloads/file/46556402653.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/jibazopalabin.pdfIn PDF document text
    • http://bingsu.ir/cache/fck_files/file/27823907250.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/vonugukizarivisumukexara.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/65903305430.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/magejuzeneran.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/78443965449.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/1hHberoKktI/uplcv?utm_term=corrosion+meaning+in+kannadaPDF 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_off0000d890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A2 24104 bytes
SHA-256: bccbd061888f0a252048ebd32689113161b8846bd7845820d917a3877b399fe5