Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb9fedfda53f18a…

MALICIOUS

PDF

75.5 KB Created: 2021-09-16 03:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d710f18756b7bb68aa62062cd42b050 SHA-1: cfb608f72b3464fd29dfd3de8af16e523819177d SHA-256: beb9fedfda53f18a040adc9403b1443fc3826fdf3630aff946ffc1270df0821c
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics indicate the document acts as a link farm, directing users to various PDF download sites, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://noithattamphuong.com/upload/files/sinadazabalasazipumel.pdf In PDF document text
    • http://regcureguide.com/files/files/leguvopebekuva.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/putavo.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/92143038342.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/92184056251.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/sawivutatozunufafugorako.pdfIn PDF document text
    • https://langumeistras.lt/i/File/44935449324.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/90677010832.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/zeraxorufefunixude.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/jeminitorawave.pdfIn PDF document text
    • http://annabarons.lv/files/files/74525948109.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/pelukufoxanajumatedano.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/df86a8ef3b9e7fdaf8c766582d5f4815/93426419084.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/fugoxo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130061723c71---rinuz.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/47438873536.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/dofigerikasolanexutudime.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/wufadozerizagipavosag.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/40373959431.pdfIn PDF document text
    • http://electric-kernbichler.at/53685610294.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/78863872835.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/82229447532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ludo+king+mod+apk+always+win+blue+downloadPDF 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_off0000c2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C5 11024 bytes
SHA-256: ec9b8c09ba09484d453fdec4aa10d0c1f06955e234cec0f14698300969515cca
font_01_sfnt_off0000dc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 17112 bytes
SHA-256: ee7c564aea3d30dc3aa10b2aa22f34d65bbae95a884f755744659cdd320f5087