Malicious PDF — malware analysis report

Static analysis result for SHA-256 664b890230ed8322…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 12:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3fefba2559cad48905047fd2e2ed6722 SHA-1: 2b4fc6967ccf2f5177e7cc1587fed8f850278af8 SHA-256: 664b890230ed83227614b829f228bfebd78590546b7dac727a79523667963710
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URLs, with many pointing to disposable hosting and utilizing UTM parameters, indicative of a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan variant. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://smidgel.ru/uplcv?utm_term=auto+clicker+for+games+android PDF link annotation
    • https://hiroyoung.com/data/files/kesujuvupekafelumifudud.pdfIn PDF document text
    • http://retailcop.ca/files/kobetozaxuditid.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/lopizobezozewobudikumipix.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b99d63f2b---12150392714.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/39322735256.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/4674657971.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/bajifiwubepofiku.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/jeriruta.pdfIn PDF document text
    • https://domilot.com/uploader/files/ximikesiregajo.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/xenabamos.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613075c5479f2---75372482491.pdfIn PDF document text
    • http://novichiha.ru/pic/file/84730914644.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/saxatutobikonunudibiwumi.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/35268246681.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/37153633414.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/90226075968.pdfIn PDF document text
    • http://prmakeup.com/Image/files/17097701471.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/27147900182.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/2190385962.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/62722676426.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/penigofimaka.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_off0000af70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF70 16388 bytes
SHA-256: e36182df4d103a002db66042e303575bf73a1c771f941959e5eded4fd351dce5
font_01_sfnt_off0000d968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17F 10992 bytes
SHA-256: 79b52f71a5764f35282659cf0fdfd99ad8a0c0eba96b994b7353198885a5515c

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