Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae888b070c2662c4…

MALICIOUS

PDF

68.5 KB Created: 2021-10-01 00:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 39e40d57ca1172c54f94bc2c41973a92 SHA-1: 8abc26ac3234f6f076fe7b66ecfae43c359d007b SHA-256: ae888b070c2662c4bef19f768a251b882eaa3f5bfe47493252f9673d6b312529
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a large number of external URIs, many pointing to disposable domains, indicating a link farm or phishing lure. ClamAV and ML classifiers also flagged this as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=high+strung+free+dance+123movies PDF link annotation
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464ab6bb732---wowilakonodixipe.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/guzufudoxokobad.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/rufofadalidebid.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/binopi.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/suritukolop.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/g09ma9tgg087ve5bi3f7dakqdg/sutezudizowifuvofexe.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/mexiwutiwopipusigu.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/89280267875.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/22228777969.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/dezuwegag.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/42578421358.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/xesasukalixejakafawezi.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/tinumojeniwejesopebamagug.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/8644078281.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/83763941467.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/roruvewalirobapususe.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/84814532951.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/vigof.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/rafexo.pdfIn PDF document text
    • https://1ar.sa/userfiles/file/87333633185.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29B 11380 bytes
SHA-256: ab66e3a79213528f633695d68c6795ba0a761783e48874cb84a942737c0c39cb
font_02_sfnt_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 15612 bytes
SHA-256: 64a4ee751302051ac8784e24404cb1af88b95a6661db1a633d04dc6dcff2e9ca

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