Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7469fbf982c56a9…

MALICIOUS

PDF

86.3 KB Created: 2021-09-19 16:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f867bc753238a6e58b93d6c335948d40 SHA-1: 2ab0fe87b2798c9520ca8aa8586a04101ac0eaf4 SHA-256: e7469fbf982c56a9004d42eb515dc343da0e584b02835cca0d34a437f7f6957b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of multiple distinct hosts and UTM parameters in the URLs further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://chcial.ru/uplcv?utm_term=adult+tv+live+apk PDF link annotation
    • http://efcosmetic.com/uploadfile/files/99299849960.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/lupobotiwelobolupezexeb.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/49495720974.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134f149b27f5---54277378357.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/bazarebewozefogemuwat.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/jarebigewefoka.pdfIn PDF document text
    • https://karthikaspices.com/uploads/file/rozukapom.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/62344603769.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/bejaxiwero.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/23510725247.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/nidolekom.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/wozasusina.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/wobokuwemevevimozu.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/zojili.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/27625415895.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/34070873058.pdfIn PDF document text
    • http://salt17.com/userfiles/files/vamigujuru.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/24431110174.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/dd2e4719fc8d10f6579fb37d84506932/42140183285.pdfIn PDF document text
    • http://ceroki.com/image/files/59588913610.pdfIn PDF document text
    • https://whitesal.com/data/images/file/4909_20210911184658.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vavalugaduzafewuwokiweki.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/14/jewijugibezixagamos.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/63855497642.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/biruzutowifofegabulabu.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/puzosasagilesi.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_off0000ec97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A9 18528 bytes
SHA-256: 36c5efa9ae1ab7ea15f8e33457882a9aa1661088c0e8f66c6801481cff2e4507
font_02_sfnt_off000134f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F5 10132 bytes
SHA-256: 97071dd6823cafe5bdde119496d81c224bf0db293554711ab8dca6ae80f0b9a9