Malicious PDF — malware analysis report

Static analysis result for SHA-256 466d5e1cc9ac99f3…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 08:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 59543f9e8603f66b222427674452174e SHA-1: b4106118e43b18ed437af3bc2cc81f0baac3c849 SHA-256: 466d5e1cc9ac99f3de1acbd17368a16ec6b73308438f73606d5c43a2f61c03a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous embedded URLs pointing to potentially malicious PDF files, indicating a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious destination by using multiple disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://1877painters.com/FCKeditor/file/bemuvigaloturuti.pdf In PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/83749582602.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/nijuvitezuluvukupux.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/93265816038.pdfIn PDF document text
    • http://krzeptowski.pl/file/56117138319.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/xubixogige.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/3094150075.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pugogamaniduwuvaweku.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/84176210006.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/jutefoselatibotosigatus.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/sidumazuzuvibafetulubika.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/vemazaxurisixutasetolomim.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/baduxafilubopig.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2c625099c---59605311946.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/36738477473.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/65577488117.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/busosikono.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/10364551118.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/xilaverebezo.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/65626042700.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/vafuvofexobizazexer.pdfIn PDF document text
    • http://iphysiology.ru/upload/kiliwogog.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/mabowewekonubabonebaged.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/61990057554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hill+climb+racing+unlimited+coinsPDF 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_off0000d604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD604 17432 bytes
SHA-256: a61327f69a06d60cfab26e0c441425e7da13c32c9f98d9b3976dee29c251fc37
font_01_sfnt_off00010332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B49 10944 bytes
SHA-256: 6455efb30189fa877d89ba445b14d88183504aa3b59635d92386b1a0c427d8ae