Malicious PDF — malware analysis report

Static analysis result for SHA-256 0913cec1d63e5945…

MALICIOUS

PDF

87.0 KB Created: 2021-09-08 16:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 607a4778902e5578477c2397dd01e9e1 SHA-1: b36af260d9d61f68fccba6c6af405add3561658c SHA-256: 0913cec1d63e5945123cce1c2d2eed6dcbf0d2d523c9a54e215cec2cbcb7ad5e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://rickgrisolia.com/userfiles/files/xijurekevimotaru.pdf In PDF document text
    • http://rsentco.com/upload/file/68920205561.pdfIn PDF document text
    • http://herve-coiffure.ci/files/mubizapupowatetojiketoxe.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/89899924636.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/duridejuxoxikirofomerabus.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/jatobebagibut.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161342870a519b---migowavigolekevez.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/kalezikape.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/19822463502.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/zixujuf.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/60830878228.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/67622571595.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/junoxogajanemiwanerukani.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/jotofogumajof.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/porimutitar.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/gejozimalinilexisago.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/86767290409.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/cd6703617844e0a71bf6e0a51fd6e679/detutobujafuzojeg.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/lifodedol.pdfIn PDF document text
    • https://visualarchive.bg/files/fefitevogijedota.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/59510855624.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zuzovisub.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/43643785673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=chemical+engineering+in+the+pharmaceutical+industry+active+pharmaceutical+ingredients+pdfPDF 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_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 11256 bytes
SHA-256: b9aa8c93b1467e2c64cad98105a5e51d9ff1028143a35143ab14897e7b05505f
font_01_sfnt_off000106f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F9 17808 bytes
SHA-256: 3135fb70472f9ca77291b26a0f0ce6e64c56d3c5ce0f55eca14f443eaf9ee2d2
font_02_sfnt_off0001350a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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