Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87f74cc10307766…

MALICIOUS

PDF

78.4 KB Created: 2021-09-08 12:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c4ac939ba8853417bab132ffb871cbd SHA-1: 6fb75920e6dbf934a5844027824440a32af0413a SHA-256: b87f74cc10307766d543a479de74cdf6f4bb5dc12f67169f9874a4758998d8e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Numerous URLs are embedded within the PDF, suggesting an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and the presence of many external links point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://akemi.ro/hirek/file/26301881627.pdf In PDF document text
    • http://studiopol.com/userfiles/files/gumabodajobele.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/89760593345.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/21881688280.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/a12e6b243998737605a09541ca4f8675/kotimovarabiputotelu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a9fc12031---34602645741.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/8691229287.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/labamodoxuputijibaset.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/60449853444.pdfIn PDF document text
    • http://sarna-zapiekanki.pl/ckfinder/userfiles/files/30552833748.pdfIn PDF document text
    • http://effektfilm.de/files/file/rabunitupilisananomis.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/75954850239.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/sakemoxitegibu.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/relupakezepubonegibaz.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/tugilolifir.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/59639029111.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/55865694473.pdfIn PDF document text
    • http://regcureguide.com/files/files/xodemezakuwoxiwakevibisox.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/71493811486.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/dixepumofuw.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/miburax.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85962123575.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///43221809833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=tag+heuer+connected+smartwatch+manualPDF 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_off0000cdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 10876 bytes
SHA-256: be8f2a00d52df8894407a0cda9014912964ca4c57c969b1fd180f0475ebe8f82
font_02_sfnt_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 17348 bytes
SHA-256: 984095f9b93ad1c21e411b94e0e1f0d2e1f1fc9bf84cb2e65b24e660b3ba9d9e

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