Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0c8858e8650ab9…

MALICIOUS

PDF

75.1 KB Created: 2021-09-29 08:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 36d337178bb9896e7184333b490139b3 SHA-1: 7984470b6fb6d278f8ee43438c787d80a95393ea SHA-256: 3b0c8858e8650ab980bbe02d9b226036acd26b93b2bf86b21c073dc8b294bd26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs for SEO manipulation or to host malicious content. While no scripts were explicitly extracted, the presence of external URIs and the link farm structure suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ryyw.com/upload/files/2021/09/202109261425259324.pdf In PDF document text
    • http://vividconcept.in/userfiles/file/21705664.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/73159359149.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16146e23fafdaa---5680906505.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109041555432586.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/lidubiwuvikabanipor.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///88169287973.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/fosigogadusagemupava.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/gematu.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/vugugilo.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/vojewuvud.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/togotovisurarem.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210918_212135.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/54298842381.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/99448309208.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/puweruril.pdfIn PDF document text
    • http://feminella.ro/upload/fck/loput.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/14898664817.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/38391215463.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/madibusalab.pdfIn PDF document text
    • http://thaide.org/userfiles/file/2092497358.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4c525d874f06d08e90ccd20a7696cd09/57789024644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=alice+in+wonderland+read+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_off0000be53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD665 18976 bytes
SHA-256: 923c99e8d7d42b9104537edb2fd10348d3b253ce1d4997c367d7aa5bec0e056b
font_02_sfnt_off00010747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 10412 bytes
SHA-256: 41467d227d6c5edf483ba2be1264d1992b638f4a81c8624df948e20a2a73cab4

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