Malicious PDF — malware analysis report

Static analysis result for SHA-256 185884a45a35ea1d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 09:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bfddb068db8a02f0610d8d8c4b904078 SHA-1: ccc9515ba59636f3759e329e8d9c6a91975532d2 SHA-256: 185884a45a35ea1d441582ab741117720dd46a67103f5e7412ad886c21fbc85a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The presence of numerous embedded URLs, many pointing to potentially disposable domains, supports the classification as a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bunianco.com/other_files/File/81796442609.pdf In PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/gitidided.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/55589402581.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/borosawawuvevazon.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/noboju.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399c363a6d2---xekogutolazuf.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/vejeviwefuri.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///59419362502.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/1480025930.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/6994968896.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/20100795926.pdfIn PDF document text
    • https://epiphanych.com/images/file/junevudagevujuwegafos.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/2344896779.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/vovemexafu.pdfIn PDF document text
    • http://mobilenmr.com/files/files/mubupavegiliz.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/divurikazuzasidezunigibeb.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/36110316989.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/31905073811.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/gipawubokazitofiduno.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/64245286006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=where+are+my+photos+saved+on+androidPDF 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_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 10784 bytes
SHA-256: e4907d9e1f897449da74e0ca2464be88b0e469286cba8021e2f562d10980fec0
font_01_sfnt_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 17684 bytes
SHA-256: 51d67f793fe7b6cd6652fc3d2290654e6a28896ead04b4a0641b47f9f9191219
font_02_sfnt_off0001211b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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