Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec23bb0e3bde0c6…

MALICIOUS

PDF

73.8 KB Created: 2021-09-09 19:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c4a00f1961ee81118d27407787b535d0 SHA-1: 22be9481b030d1c9105b6ea659144e744781434e SHA-256: 8ec23bb0e3bde0c659c861eb79034404766203e66395003434e9553cb4b12fa2
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 0.9980

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://synerhu.ru/uplcv?utm_term=tales+of+the+kama+sutra+2+monsoon+2001 PDF link annotation
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109041951312715.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/91635152383.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/petuxovibexadetanup.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/gotakutav.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/46276932555.pdfIn PDF document text
    • http://coumert.com/images/file/59059349313.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/wesawomamiwidosanur.pdfIn PDF document text
    • http://micruts.org/userfiles/file/beserufuziganunapinavi.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/86620208640.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/genanolalufosonenuxoju.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/wepogugituwakuvivil.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/0cd0ba335bb3413765187a1442ea724c/salufezesasasiginif.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/dalubekukoxaret.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/tagiguregufiworizusu.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/34812377304.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210906071840406.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161377438edf2b---90403526688.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/mejuzuv.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/gixewisejotepudupoperera.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/zajip.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/kuworuxuwaril.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/36931450893.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

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_off0000ba18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA18 10836 bytes
SHA-256: 9a8a2fc1b4dec8c1b0312b2458ed49cd91080bed976d7bc165cf41efc0af5062
font_01_sfnt_off0000d312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD312 17524 bytes
SHA-256: c88083ea8a3818988c22c4e12f810f90bf86342a49efa81892f966dc551c81e5
font_02_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.