Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dd6b32e19d5a90…

MALICIOUS

PDF

71.4 KB Created: 2021-10-01 07:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bda48baf5f8c3c1ccda6da454e4ec70a SHA-1: adc25b733e8d6b6cdf9f4a5e5cf126f09a80d29a SHA-256: b9dd6b32e19d5a900d365359a59f7ea67e8910ef0a321b00417dea79efd1013b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to suspicious domains, suggesting a link farm or phishing lure. The PDF structure and embedded content indicate it's designed to redirect users, potentially to download further malware or engage in phishing activities. No scripts were extracted, limiting the analysis of direct execution vectors.

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 https://kozmetikadunakeszi.hu/userfiles/file/874312105.pdf In PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/jopixutupegasisukasalukox.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161464d31edf6a---susifok.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/didajenarilipokox.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/1901869903.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/rezukefanebipuw.pdfIn PDF document text
    • https://grouptm2.com/contents/files/wurevorevezimorul.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vikilepivazunixebibu.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/54383282202.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/35404666784.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/13645173555.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/48333835518.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/1797980739.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/c0d53b5e827b3b8299623df1646fa7b8/susefuramapivagewir.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/51921966586.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210921090205.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/nuxuz.pdfIn PDF document text
    • https://satesayap.com/contents/files/suxigivaziroza.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/zifuboxusarazozigut.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/53529310200.pdfIn PDF document text
    • http://gabortech.com/admin/file/81881175389.pdfIn PDF document text
    • http://street.bpv.su/content/files/files/buxakigonemajugugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+warriors+novel+pdfPDF 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_off0000b2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E7 17516 bytes
SHA-256: c4d4e8476d63cf8071ee7ce2bb4070fcf7f47137ee9595f999b7c6d743240e87
font_01_sfnt_off0000dfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 10612 bytes
SHA-256: 6db19473fffaf7cf166da1c709479f0a32f9b59a0d1d76a620cb98f5cc37a5be