Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3585e191cb8fca…

MALICIOUS

PDF

78.5 KB Created: 2021-09-24 00:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d885f6f534cd40b79bfe58e9dd0d63ac SHA-1: eb3175aa5620e71f24a6aba3b20da80bc56489bd SHA-256: 8d3585e191cb8fcab43f34854beac1cb6585b834d9943554dcb95ea3e1a7bf85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are on disposable hosting and appear to be part of a link farm, suggesting an attempt to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs indicates tracking or campaign-specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crewmak.ru/uplcv?utm_term=free+robux+real+no+human+verification PDF link annotation
    • http://back2wood.de/userfiles/file/dikijabiduradejisas.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/38156823357.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/bizelupav.pdfIn PDF document text
    • http://www.siposferenc.hu/html/sasugazovun.pdfIn PDF document text
    • http://talleresjpg.es/img/file/zujakuj.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/95509898274.pdfIn PDF document text
    • https://12tiga.com/contents/files/98368259096.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/sepaxufakuj.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/nodokepadamoruvigubixefew.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/xozozeziwajitafizudasawok.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/75634511169.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/60839921906.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/nonefulivajerufe.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/jajatapisejeninufegoboje.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fad147ae3---52335273998.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/36595357713.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/kurukinotomixumetaga.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/vuseruvelodud.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dixaxid.pdfIn PDF document text
    • https://coevent.ru/upload/files/1714394486.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/144927658061474e0fd7785.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/netuburuvenuluta.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/fubakelikotesisi.pdfIn PDF document text
    • https://businesslife.com/content/file/pesidanovidaw.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/losutug.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/wefamupikej.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_off0000cdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCC 10816 bytes
SHA-256: 030cfbd074a789816f90866c0256a6354e7227424f13c3162b831e25571711da
font_01_sfnt_off0000e688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE688 17684 bytes
SHA-256: f3463823250375086892ee0ec4e16f71ca70e3251c48fee1841f9aaa0d7bbe21
font_02_sfnt_off0001141e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1