Malicious PDF — malware analysis report

Static analysis result for SHA-256 402e5cddb3068acd…

MALICIOUS

PDF

98.5 KB Created: 2021-09-10 02:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff6de98c76908ba49ab52e69530fa767 SHA-1: 5e2e1c93163bbf546b6613436a10f8b5c2e311f0 SHA-256: 402e5cddb3068acdf99d7ec6e6717a5482ee6bb722b23d7a16d714089635fa82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=the+night+comes+for+us+streaming+gratis PDF link annotation
    • http://tsuiteru66.com/userfiles/file/baxasa.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/vunegonafawutikogir.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109032049079316.pdfIn PDF document text
    • https://rm-parketi.si/uploads/nerumifilixivurepereno.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/dotuwatexezuvobur.pdfIn PDF document text
    • http://dasbluemchen.com/49907069274.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/vukakeburidiba.pdfIn PDF document text
    • http://warehousetraining.ie/images/1089570540.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/80419695559.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/fitelixi.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7a551bfe98b28fd30125aa488fbeff31/dobanovikozojexosike.pdfIn PDF document text
    • http://cplastik.cz/data/cms/file/71569399847.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/fawipepogekufikoworogale.pdfIn PDF document text
    • http://www.520amis.com/upload/files/38757757280.pdfIn PDF document text
    • https://magatek.com/documents/file/91356459884.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/55528677380.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/zegasujurojuwisojowo.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a770f98b75---mopuwaj.pdfIn PDF document text
    • http://skncn.com/u/files/ropanurotapem.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/6676746275.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210909065453.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_off00011943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11943 19316 bytes
SHA-256: b9a7a7d6e4446320f5c26f10ee655021842d4a7e22582e5e72af2229dd9079b4
font_01_sfnt_off00014b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B88 10800 bytes
SHA-256: ae1692a0e693f3eed44bc7605e9487bffcdbbf77df93c9860cc4eab681ab6078
font_02_sfnt_off00016447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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