Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd7fcc44231296d…

MALICIOUS

PDF

77.3 KB Created: 2021-09-18 21:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 439efaad87b6716825ba4832cd88265a SHA-1: 334a1160c285cabd3d96d4c418be5d8b6ebaeecf SHA-256: ecd7fcc44231296db2be8f3450d8e8364de88d1525cbde5e4fef5fb1036c0979
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 intent. The PDF contains numerous embedded URLs that point to external sites, suggesting it functions as a link farm. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://exlite.it/ckfinder/userfiles/files/luzafejatigexodunituxagad.pdf In PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/biwavupa.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/ec7688baea719f0807bdb46265835031/76148161175.pdfIn PDF document text
    • https://solturism.ro/images/file/22206866671.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/16edd98f344c8f9bb0757c801d6b37df/15162709871.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/8267680091.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/59034641680.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/10104839124.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090509173889.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/dilaxewawazarexibibozuwe.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/powodob.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/bapotepipafekumik.pdfIn PDF document text
    • https://chptravel.ir/data/file/xaviwivufel.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/46968802665.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/47397145710.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/xujivigevawekut.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/boxajetokux.pdfIn PDF document text
    • http://punaide.com/userfiles/files/sinefesulefotuj.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/sonij.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/13850827886.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/31658157627.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/nalajesadika.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/sogofiw.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/65576993158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=roohi+full+movie+freePDF 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_off0000cb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB27 10156 bytes
SHA-256: e1de7f6ddfa14af22c4d2c108c2611030bf7c8e0ba1cf5625cb4cd007fd10318
font_01_sfnt_off0000e1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 17700 bytes
SHA-256: 6b6ca5f7f75bd4a0d600ef6b1b1970f31a335475e7e9a8773707496f0c505313
font_02_sfnt_off00010feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1