Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb5e7498209625c…

MALICIOUS

PDF

86.2 KB Created: 2021-09-23 11:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 994da5e2db34a586543a1d07c86094f0 SHA-1: 0451334e1ae1e6777a95f0ae80749eb59c9dfc28 SHA-256: 8fb5e7498209625c609603d82e6e594aec97d2a1e064384915d887ec072deb75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to host malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea of a link farm designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.dilipprabhavalkar.com/images/file/weletanefonelevolakuna.pdf In PDF document text
    • http://splogservice.ru/content/file/68439010180.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/95554621382.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/jopubutixaxexajalobikosa.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/liburinajidikididera.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/30795914629.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/feniwopoxizeseru.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/zigilozakurezulirabek.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210918035321.pdfIn PDF document text
    • http://geodez.com/pliki/file/daxube.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/nadawevurenisawo.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/pomojufusegan.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/foludusapisusekovolasimo.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/revikeseromi.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/tiwuxulipo.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/rujiribesawiwezalas.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/74112797744.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/36089697849.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/89153976618.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/lutirobiwidirasoketo.pdfIn PDF document text
    • http://gestioniarmatoriali.it/gokujapikisotelugojesoja.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/96174597294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=minecraft+android+pcPDF 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_off0000ebd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 18616 bytes
SHA-256: 821c47cfbf9703eba3e1fc6da7d2a1868be01fb82d12e505850e965e58c90787
font_02_sfnt_off000133fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FB 10392 bytes
SHA-256: e55214aa84a594c10ac10fe0181b1bca4ce27d2b1b411e59f2cd5f5a4daf8411

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