Malicious PDF — malware analysis report

Static analysis result for SHA-256 17167de12d633626…

MALICIOUS

PDF

77.3 KB Created: 2021-09-16 19:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aa1472e1fb77edb68ee4793af459c114 SHA-1: b1cd7ee4179d9681e602e7665dedd5d31c08bdcf SHA-256: 17167de12d6336265762b348f2f1118dde45ca252c90939e64a9187dd3d4cf0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains numerous external URIs, suggesting it functions as a link farm or a lure to external malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URIs strongly suggest an intent to redirect users to potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tamphuctriland.vn/upload/files/56586302599.pdf In PDF document text
    • http://www.vegagastro.pl/upload/file/60187762500.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/fupidamifutuvemiv.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/vawebakuk.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/welirutasevesuravunofake.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/34271213610.pdfIn PDF document text
    • http://klinok-saintp.ru/files/wusodubazuximodiseti.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/bavimaz.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/sakoluzunufafojivukirepe.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/38957790155.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/bomekimokuvudoxofarob.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/23777505671.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/ruxejev.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/vulirupulubag.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/54413140406.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137da487aca8---xolubidi.pdfIn PDF document text
    • http://gysanya.com/upload/file/2109052316248562454l1ugegnv5n7.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/votejakatobisudozuz.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/regerexate.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/panidif.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/82062977012.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/bikajimimisexixixuma.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413a0d29c22---71168317937.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/58670248190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=minecraft+mod+1.7+10+backpacksPDF 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_off0000c8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B0 17412 bytes
SHA-256: 5ceb1ef0f23a4afcb15f9cc171e9810888301af10c2a9d860ab8f0a0b5f4963e
font_01_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 11252 bytes
SHA-256: d14a99a0ecb208d932a3947eb25e962a6c1cfbbc9002175aa4cf02c5a68686ee
font_02_sfnt_off00010fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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