Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd1576c597bdc61…

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 00:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af65aad6b6508230cd933ddaff314377 SHA-1: 1de9a5e4d84aa993ff116f3d5139d05765efbdf4 SHA-256: ffd1576c597bdc61c797688c9fef8a5ea940c836e1b00bfef5c8f7b12de84a7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=farming+simulator+19+mobile+free+download PDF link annotation
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/wadusudosaxinolasipelalin.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/jegikutunusonivikugofek.pdfIn PDF document text
    • https://tch.lu/files/files/5123056851.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/25640079897.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/jugenidamanamu.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/pijup.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/sarumeb.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/58103459044.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/73823475411.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/dijorezozopenifegef.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/zevovedefugaperaritu.pdfIn PDF document text
    • http://ducthai.vn/userfiles/file/3927135210.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/35857779314.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/23574998833.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/rabupugulozumixojo.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/kezufafe.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/97674160358.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384727aadf8---mubexetovope.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/52147152114.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613731325af1d---vexusexalesesovidawuwul.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/4567186266.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/34535142165.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/tavasomivinujokikusifinu.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/97174071966.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_off0000e169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 17832 bytes
SHA-256: d20300de379742503348ae483372a419ae5b627c377e078f070b63649014b963
font_02_sfnt_off00012837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12837 11220 bytes
SHA-256: 3d232962eb9ad87f55bf2317007fd752250e41f417b7ae125beddbf9291013d2