Malicious PDF — malware analysis report

Static analysis result for SHA-256 573f76272b409b8e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-10 11:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d781014f4a98eeb54dca605386a2fd2a SHA-1: 292eed88843d0988d9cf0aa44ca09432dcc6ecfd SHA-256: 573f76272b409b8e399d07de66a6d93a8c6874f0bc7e6774d21f33bceebfd2c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers flagged it as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM suggests a phishing or redirection attempt. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://highfieldhousehotel.net/nbloom/fckuploads/file/gotobuserobakap.pdf In PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/50836364880.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/94112612271.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/xekotalemel.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/zaniwotinulotexubuwaw.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/94619866060.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/16963959914.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/wevekuvilupoxapamivalaw.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300a36d686c---82436139687.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210901230353.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/41478990996.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/91063853022.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/gomemesisaluzatibukifexo.pdfIn PDF document text
    • https://jobtiara.com/files/files/36186322278.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109050538391365694psk6z.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/7402524154.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/26137623526.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/59391823330.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/79752796395.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130acdab6021---21588298514.pdfIn PDF document text
    • http://strandedtattoo.info/file/wuforifumukugebofalexes.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/49761985040.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/67354558090.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/mejuzuv.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/13322983482.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/begejoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=emoji+galaxy+s3+miniPDF link annotation
    • 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_off0000d06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE885 10620 bytes
SHA-256: 96272e651c5373788caed5c64e84a39593a338e46409fc15fdd9b2ce79e5fc51
font_02_sfnt_off000100b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 18960 bytes
SHA-256: ef61f52d3bc04b5bc9fc17baf430bd1a66462da10f34cb0f581835fa7bffa47c