Malicious PDF — malware analysis report

Static analysis result for SHA-256 135c7d4441ec5bf0…

MALICIOUS

PDF

69.5 KB Created: 2021-09-24 20:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0879829885b08993221a7be5490e569 SHA-1: 8d0207510918eaf0b6380f4dba654f631c0b8a71 SHA-256: 135c7d4441ec5bf02f5e57774b1bebcc56442557a57fc6da49e9978c621296a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a high number of embedded URLs, many pointing to unknown or potentially malicious domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is designed to host a large number of links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://brianspradlin.com/userfiles/file/mikumimeruwavo.pdf In PDF document text
    • http://vuoncotichdep.com/upload/files/pajejixo.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109151543285734.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/bavalewusuw.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/numanodukodogamirujogutut.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/kugavikikavukodup.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/nobumulisatakukabez.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/48318569760.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0e89420e522b096d78f253db47f97298/35791335871.pdfIn PDF document text
    • http://theponghop.com/upload/files/20717048123.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/mezudipemesevazokimivine.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/xewujapikurapamar.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/solizuxarokuruwemirokam.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/guzitajofesovipej.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/92895419497.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/nubotumiwulagifunogide.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/65861839937.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210918115900.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/rusazovameko.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/puvixewol.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/lapajiwuxe.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/pedeserigatubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=android+os+for+windows+tabletPDF 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_off0000af19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF19 10556 bytes
SHA-256: 8c1b7c787b9baa67c87cff1fe700410c1fd6971e20313f60298fb1516b08fdc7
font_01_sfnt_off0000c764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 16152 bytes
SHA-256: d80d6f6fb3304a0452d821de4c9d326e12fec5ac05a862c9db8ce228849f6a34

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