Malicious PDF — malware analysis report

Static analysis result for SHA-256 34576e1799cf2ba4…

MALICIOUS

PDF

77.5 KB Created: 2021-09-13 23:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 244cd7f8b359a9e20ffe29b2c2616275 SHA-1: b9f66a2a37daab12120b81c85d584f6167c39b84 SHA-256: 34576e1799cf2ba49b0336643ab849b861583f0fa20aa2ff976e64907e3d6bf5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external links, with one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

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://diphong.com/uploads/mawususamifipamoradelo.pdf In PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/38063603793.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/zimasurogirowozegajana.pdfIn PDF document text
    • http://boki.hu/editor_up/70379831868.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/56552907047.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/96475781700.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0cd4d99a---xelosotuwogogukonuv.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/zaseguwagi.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/79074237296.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30212264965.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/rukijomotavudo.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/gokotelaf.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/ganetuwurixosunav.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/44912603856.pdfIn PDF document text
    • http://chinazzjx.com/d/files/kawatapeviwotolaveleru.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/77442609193.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/10739292194.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/42485010331.pdfIn PDF document text
    • http://kco.su/userfiles/file/3096898538.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/bewuzupemizofazal.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/21677589674.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/zinebupun.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/b142aeea51b26e35da6e835b0275cea4/23624308722.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/5590414478.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/sejonipifunokomuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ball+placement+for+hybridsPDF 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_off0000c9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 17148 bytes
SHA-256: cf6772a0f5727b180a82050914ab53d88baac19bea49664778b1540e93ff0a58
font_02_sfnt_off00010e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 11192 bytes
SHA-256: 2c4de00a97f513cadb9c52dea8223d5b6890e4ee84cbbaba0d8f62163a3f74a3