Malicious PDF — malware analysis report

Static analysis result for SHA-256 18446f482f003e8a…

MALICIOUS

PDF

68.1 KB Created: 2021-09-14 09:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: beaa65508779dfb1b574c5dc2132cd27 SHA-1: 50445f3c0341fc3c54eb9aba28d16f5b58088981 SHA-256: 18446f482f003e8aad1585ad27e19600b530694a69921d3e104f081c1304ca18
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were extracted, the presence of external links suggests an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://cpviettin.com/upload/files/gevimubejifolir.pdf In PDF document text
    • http://sbcnepal.com/images/file/21644286209.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161364b673209c---potesoragoxusunuletavexa.pdfIn PDF document text
    • https://invest.pl/userfiles/file/watepemajixuzutulimowumim.pdfIn PDF document text
    • https://kiptep.ru/file/98172641680.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/kigafaxasu.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/70485049900.pdfIn PDF document text
    • http://kccmaul.com/files/files/pigedogewuguguwezatoboda.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631052052.pdfIn PDF document text
    • http://steinemann-ag.ru/xebagojujuv.pdfIn PDF document text
    • https://nistd.in/userfiles/file/wewafuvepujovafudepo.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090505152673499.pdfIn PDF document text
    • http://househouse.it/userfiles/files/zusekimudiguna.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/91313061754.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/fimekekefitili.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/moduparifaweju.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/lobiz.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/64411313360.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/tivesotet.pdfIn PDF document text
    • https://vleek.com/uploads/files/xudesalizukix.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/31525733874.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/timiposamibawi.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/sokovebumitodigomaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+cast+laptop+to+mobilePDF 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_off0000afac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAC 14400 bytes
SHA-256: 81b0f974e5d2a1c7dca80241a136670fb4e5cfa815f5a4c2cea3a8c185531bd0
font_01_sfnt_off0000d350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB67 10548 bytes
SHA-256: dfbba916f12504167153326b6b38e73cbf57896a15da90d1eebad4d26032806f

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