Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5ab831f32e5610…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 01:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 1cbbbffa95179f34197bc228e0b2aa96 SHA-1: 8eadd6ba059bc1c6a6f41cb971687273cfd894f0 SHA-256: 5b5ab831f32e5610178562a220bce934c17b1b8d3aac3261aeec92323a2e4eb6
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://lovec.bg/root/ckfinder/userfiles/files/moxitat.pdf In PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/17710821781.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/30072369540.pdfIn PDF document text
    • https://educhina.mn/editor/files/janilit.pdfIn PDF document text
    • http://viorina-deko.com/images/file/divazuwotebodapa.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/goforidalofujuvagezawa.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/pifupawemadenepilovusosik.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7eb5b445---xobotobosizelo.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/zekilinuxenimepu.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/5824229386.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/fupowopobizelo.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/61823892510.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/koroduwejikozes.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/nitozuzoturokatifivajoke.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/tujomewotewilokigeluxufe.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/gusivafan.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9b298ead5---45926480645.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/5368959863.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/55269980292.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/84663923801.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/74026869633.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/75742970700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+physical+principles+of+the+quantum+theory+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 17520 bytes
SHA-256: d542dcd407af0562f2d34648c1583cd2d248d5c4ba2ac9ec60414a11af8e3622
font_02_sfnt_off00011af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF5 11208 bytes
SHA-256: 5b7312578c62b84c90693f9d7501951fc2301d27cc8a3ebbe67bbccc4dfbd079

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