Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ee99f69b83ac59…

MALICIOUS

PDF

80.2 KB Created: 2021-09-15 22:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b39f7c4ed42e1ff89c42bf9ef631fe4 SHA-1: e2fb7d01e61c3135252f927fc96dfd2c8158c380 SHA-256: 20ee99f69b83ac59978ac67e619b8455d636fdf80f08b60ee1db76fc1bf2e90c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://agriturismoilcolle.org/userfiles/file/44482572871.pdf In PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/8679787956.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/ligobevavesapot.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/movefuga.pdfIn PDF document text
    • https://htchninc.com/d/files/rufuwepizezenukabi.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/xuboreluvimexorebujeworez.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/fevivukaxipizorutabo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a26b997991---powotopoxugi.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/54141938846.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/ponarejevobopijisulu.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/52696880521.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/97161431897.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/jukivogajubaginoso.pdfIn PDF document text
    • https://heureka-cz.eu/files/56428095213.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/jesuworuvomasuwebunesodu.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/89118563650.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/refuvub.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/87414092371.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/65579432721.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/wofobozavuguludalotinodip.pdfIn PDF document text
    • http://machin.kr/userData/board/file/fukugibixosow.pdfIn PDF document text
    • http://maihome.hu/admin1/file/1203016976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=word+chums+cheat+most+accuratePDF 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_off0000d643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD643 10488 bytes
SHA-256: a13eff3e95eaabf1136c2a76a293d02ede1bdb16c297ce36ee553a0be2ce9fb6
font_01_sfnt_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 17436 bytes
SHA-256: 16a6eccb8f86b1d71c847088d6fe212fcba643bdc4f982bf42529d443fb8b32b
font_02_sfnt_off00011a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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