Malicious PDF — malware analysis report

Static analysis result for SHA-256 044a456578f980e5…

MALICIOUS

PDF

78.9 KB Created: 2021-09-22 19:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb848bcb8cc1e70acf64bfc80fa45e3b SHA-1: db320a9297a0b4745f872a19e878d8729f192533 SHA-256: 044a456578f980e5c148ed63816e6c96564b1ad513851f005eb68a6209b16598
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct, potentially disposable hosts. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://maremio.ru/admin/ckfinder/userfiles/files/ditomeduv.pdf In PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/mosujunajave.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/81058832941.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/21093136573.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/82181664459.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/59862479348.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/82771391569.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/rulogigezevodo.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/sobezutevusobefowo.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/jeguwij.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/gekulelofasanixaxif.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/mevamidetilapufoduzow.pdfIn PDF document text
    • http://jobsmarttampabay.com/files/public/vikodasizejivogokirifawub.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/50250249652.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/desafusi.pdfIn PDF document text
    • http://napiarsaigh.com/images/17691114404.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/10242231077.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/39923189434.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210920092259.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/79666729788.pdfIn PDF document text
    • http://all-premium.com/user_file/files/28426084152.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/mq3jt4lao3q6h1odpa9kgbb7r2/67919459456.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/40589496241.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/poxubig.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/pokupivirom.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/pivogojiledejugu.pdfIn PDF document text
    • https://cowik.pl/upload/fegunarakupelalafikevajad.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/21627046629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+do+i+transfer+photos+from+my+android+phone+to+my+computerPDF 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_off0000cead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAD 11132 bytes
SHA-256: 6d0fc3042a0857f36159e24a308be5265bc1be65486e0c8b550f2af765e2f3a7
font_01_sfnt_off0000e87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 17380 bytes
SHA-256: 2dc6b6bed8bca3bbac6196cc77463a5b9df4f6387cc1236db454869f181272e1
font_02_sfnt_off0001153e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1