Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f0377c6963bc1a2…

MALICIOUS

PDF

69.2 KB Created: 2021-10-03 07:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 607b157a17f0ce69edf761cbf1a1112d SHA-1: 4f055cf5da87a61338fab122c91cedb65c49464e SHA-256: 0f0377c6963bc1a253e21b0e17d6a71f899a361070d7dd4a9bc427ed8431d2b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the presence of numerous embedded URLs suggest the document is part of a link farm designed to manipulate search engine results or redirect users to potentially harmful content. The primary IOC is the domain hosting one of the embedded PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://scantech3d.com/files/43317941453.pdf In PDF document text
    • http://emrc.ie/upload/imagecontent/file/773933534.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/losedoguwowibutofese.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/zobatogimopibij.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/43893569897.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/38207892331.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/739838897.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/97903485989.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/37710210.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/widababunomupuvezada.pdfIn PDF document text
    • https://eventaipei.com/upload/files/nixijimukiduvakexe.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/47724329265.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/guxotewaza.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/zenuzaguga.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/mevidiva.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/nugogof.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/mutitobepi.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/50422263829.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7585fb763430e1dab4206d249dceb73f/negunolulu.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/juzevavetexap.pdfIn PDF document text
    • http://langyupharm.com/upload/files/13244941328.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f19d6b4e13---faxagukojumujujonuzowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=communication+in+healthcare+managementPDF 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_off0000b11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92E 15004 bytes
SHA-256: da54d8348630e534b4743b47f9b3a2b2cc79a690dd462198e74f913acf9187f0
font_02_sfnt_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 10640 bytes
SHA-256: afce2ade62f0250c5572c9ba3fef52d74ea4cb379cc661114b83f88caa415e5f