Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea41c45df51aa6b1…

MALICIOUS

PDF

86.1 KB Created: 2021-09-10 16:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 349ba68aed9b8caf082379174eda2ef5 SHA-1: 7a548c956935f0324715719fe99205cbaeb0b6c1 SHA-256: ea41c45df51aa6b1f082cad0d89e02aaacfbea7ebb3c33bd6ad78482f48c5653
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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.
  • 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://soi.icami.mx/ckfinder/userfiles/files/gapegofaki.pdf In PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/totokosipunazi.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///75619946256.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/pigoripisixapabamek.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/42687791484.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f078d7440---kononelepebemotawotozov.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/kuperez.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/50534401966.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/5788df9384500e0080ea9b518d22f2d3/patizupuxe.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/gunupezefarib.pdfIn PDF document text
    • https://rintrans.com/files/48505630430.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/lavakelokidakimokiw.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/kovamadufibedu.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210901185732.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/13207110831.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/78530501160.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/28881886175.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/najuvivuxasokon.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210908_170014_1810.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/talezokefad.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/bobakejorezigalibaxan.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/38675925905.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/55402178891.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/xegusitogupovibesevuvowa.pdfIn PDF document text
    • http://dd-eng.com/files/files/matetunepeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+remote+code+execution+exploitPDF 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_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 18084 bytes
SHA-256: a37d8c492a8878b49517e39792f4cb4e320f7e03dc51ec56c52a4a24dc523294
font_02_sfnt_off00013189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13189 10528 bytes
SHA-256: 16c936605616846244079615549b1300a991dce1b3c5c58c6186acb50a5896d8