Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbae94185ab1994…

MALICIOUS

PDF

74.3 KB Created: 2021-09-18 15:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d1f0a3350c5cb129aab1fe4a31e7ed9 SHA-1: 53ea3f7094273741f84979b9d084d99fa529a6f2 SHA-256: 7cbae94185ab1994b62ffe5567e2257a4459cdb39867ce12214ebebd60c22347
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML and ClamAV as malicious, indicating a phishing or malware distribution intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm designed to host malicious content or phishing pages. While no scripts were explicitly extracted, the presence of external URLs strongly suggests the PDF's purpose is to redirect the user to malicious sites.

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://coretry.ru/uplcv?utm_term=best+budget+smartphones+australia+2016 PDF link annotation
    • http://htwy.com/upload/file/69693661418.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/21247044862.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/89165431640.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51395635429.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/ramagu.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/balazedaxi.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/91606345540.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/jesuwufisuka.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/jiguwomulujoburenenepasur.pdfIn PDF document text
    • https://kapefashion.com/files/files/ruwonezotuta.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/92397893370.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/14444045618.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/luwizabufubazewujuton.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/sulosinewolulimutovivu.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/fakimavofo.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/zekamazetediredu.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/vunuwibomepuj.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/peraxisomisomomun.pdfIn PDF document text
    • https://filetorme.com/upload/files/51658718864.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/dofumevopitasejalab.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/lusiru.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/3776250171.pdfIn PDF document text
    • 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_off0000bcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 16908 bytes
SHA-256: 44c6d16b976492d00e6a43eefc81aefcd943e169b1253c7b3c727b8d7199e401
font_02_sfnt_off00010095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 11592 bytes
SHA-256: fa3d9b258090812212b62d033cbb52cc0976b2293980f94a22c755e909be6f92

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