Malicious PDF — malware analysis report

Static analysis result for SHA-256 66dabaf325d70cca…

MALICIOUS

PDF

76.9 KB Created: 2021-09-17 22:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f4211edae59c63d908d88b8a4a4fb42 SHA-1: a09e20ebc3921e1aed4ed7910d7d68d83beb38bf SHA-256: 66dabaf325d70cca7b0b77582b4cc919b8a2a829471120874031363fe1f22470
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is used to host many links on disposable domains. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's part of a phishing or malware distribution chain, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://hsse.cl/files/34188711565.pdf In PDF document text
    • http://cosmoscm.com/contents/files/33090420755.pdfIn PDF document text
    • http://royalgroup.at/tmp/35653784758.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202192547312953.pdfIn PDF document text
    • http://mqskin.com/luutru/files/nigoxa.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109161626075965.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/bozapiwivinapinirujobafiz.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/12286604920.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/netoxijatitat.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/17460468742.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138f7ed3daa4---fitatanomudowufetajuk.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c01b1a36e---6987803260.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/xajinafekumarobokiravu.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/232234010.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/zedufadamewuzisokezapifa.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090716340373499.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/mubaxugaxovogedimi.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/2433436392.pdfIn PDF document text
    • http://speckrepej.com/upload/file/mugetixutowave.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/82918524379.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/fepulezo.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/37441915606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=square+pic+apkPDF 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_off0000ca80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 10244 bytes
SHA-256: f0032a6d82cf430ba2663a87ab0e3d0aa3ad9c58c3260af5e35fa2c0dfb1e3be
font_02_sfnt_off0000f9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 17152 bytes
SHA-256: 74769902fe7acd0e61fe6781fb8db06a08796cc0869b9510231a57cc8f8a4263

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