Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb24f44afdf52689…

MALICIOUS

PDF

73.5 KB Created: 2021-09-23 15:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f12972fc669bf1bff1cdf072a06a344c SHA-1: 1d3eb4da45ea0a96eda2e0963cb16cfe7a3fd02c SHA-256: fb24f44afdf52689e1bc1c24aa2968bdbaf271435caa51597e429b9df63c0bb2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects users to external URLs, as indicated by the numerous suspicious links found in the document, which form a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=car+driving+4+hard+parking+mod+apk PDF link annotation
    • http://xn--e42bt3l.net/upfile/files/84878551392.pdfIn PDF document text
    • http://cci.dboem.com/js/upload/ckfinder/files/83410893829.pdfIn PDF document text
    • http://www.bash.cl/media/file/zagukupewuxifutolidud.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/72899496985.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/33241428032.pdfIn PDF document text
    • http://metapolar.hu/tmp/kepozedi.pdfIn PDF document text
    • http://telektrans.hu/editor_up/82158959453.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/10065388166.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/54750168506.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/14741661282.pdfIn PDF document text
    • http://shamayachts.com/upload/file/24608905726.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/2927146800.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7cb1cbdb---tujotalojulodut.pdfIn PDF document text
    • http://klaaswester.nl/img/file/wumekevilipu.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/nebelevuzakovarumaraputuf.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/63944186667.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/92945412060.pdfIn PDF document text
    • http://24cvety.ru/upload/files/87643624667.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/13333977408.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a9498aabf---jelotozuj.pdfIn PDF document text
    • https://rintrans.com/files/48614471854.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021911918328315.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/88577629038.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_off0000bb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB26 10664 bytes
SHA-256: 6c9f7f81756ba1e06f39732b46a73ae765bb96588d8a35f5c27ddb545496d75b
font_01_sfnt_off0000d327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD327 17292 bytes
SHA-256: b33bbe1f9ef3fee5621e8a257fafd09f4259dd78b3b4f282ade7932e2988fed1
font_02_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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