Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc62c71b3a138db…

MALICIOUS

PDF

77.3 KB Created: 2021-09-11 14:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b47b000cc20a57d66badbd2b4e197914 SHA-1: 8f7e2ae986e9ad895b3e6e57ad8da532edee68ad SHA-256: 5dc62c71b3a138db65c9c52c09d7bd8fdae831d3b6223a84a196cf35d7a29bbd
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 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://etasystem.net/userfiles/files/vesoko.pdf In PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/j3hv5sujfp050kt7r7fd6tkq3k/jogufi.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/73218620551.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/82426618210.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/27604046854.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/fopufepuwakax.pdfIn PDF document text
    • https://hssanesteban.cl/files/mejebagijutofirezavididel.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/palejijuwosatiraje.pdfIn PDF document text
    • http://whatdwellswithin.com/file/19792739694.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/41794651714.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/1026230574.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/7653378338.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/lifodupo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139f17f47043---9661161120.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/46334568206.pdfIn PDF document text
    • https://la-klamm.org/Files/files/20970084638.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/fexovuroveribidomisukeri.pdfIn PDF document text
    • https://kermanrooz.com/img/files/61015142995.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/redurawukisifij.pdfIn PDF document text
    • http://iphysiology.ru/upload/lexigilusopuro.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/24044119781.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/pipalomumirorakosidowele.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/jifuridawimeb.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/gezepalijutezixizadexaga.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/dasurukam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=organic+chemistry+david+klein+3rd+edition+solutions+manual+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77A 11636 bytes
SHA-256: 67d7c5e5aacbf2331440bb7e2c15ad1a570f62634c207c57e43995d8831c4cab
font_01_sfnt_off0000e2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E2 16828 bytes
SHA-256: e03b4f78ba5f9280879e124ca13ef5eb60d242941a910f5b7142955274556bc7
font_02_sfnt_off00010e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1