Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8bca5c7d4afa56…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 15:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 639732908fe532d219753679f25d248e SHA-1: 47a264bd74ce0d7a098f1f6a6b4eb89b945499d0 SHA-256: ba8bca5c7d4afa56adc2c3229fb8b297a54df96abafbf6d38d9d84bfb810fd12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests a link farm or redirection mechanism to host malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the use of disposable hosting and UTM parameters, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://mwcapital.net/ckfinder/userfiles/files/48854735364.pdf In PDF document text
    • http://galaxyjewel.cn/uploadfile/files/borozemaginuloper.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/muxebi.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/10135820957.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/zanufoxapokat.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/kojoramix.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/82888226289.pdfIn PDF document text
    • http://rld-carbon.com/file/81272947524.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613794fb13522---lapalikawex.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/57739489959.pdfIn PDF document text
    • http://clerus.hu/files/file/manususokewawozu.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/50030728646.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/24733633534.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/52084388468.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/14563699818.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/wetopupemilobepolexana.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/3894848894.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/bamesegi.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/27034758306.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133a64bee46d---lezatumoko.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210906_163530.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/30314912074.pdfIn PDF document text
    • http://pileki.com/imgup/file/ralenefugokububumexizedos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=free+message+blocking+activePDF 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_off0000d362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 10848 bytes
SHA-256: b4042e7e4d54a1a259f4133778ccd0dabab3d40aa7498c1d642cc73be9d71782
font_02_sfnt_off00010484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 17500 bytes
SHA-256: 306f7992b95ce104106e536a105859893fa12560ff8b335f63644c1feee9ceb4

Open this report in the interactive analyzer, or submit your own file for analysis.