Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb62546b3e0f5f16…

MALICIOUS

PDF

70.4 KB Created: 2021-09-20 03:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 18aaff907491ce9ea5e7d490a37adf43 SHA-1: 7d6a4f8904ac23743a5803829605f636b4b51dac SHA-256: fb62546b3e0f5f1681f7bf242b545f9c7a7b15c4b6f52b068a9db7919af902cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs suggest a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the nature of the PDF and the presence of external links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mayinluatudong.com/uploads/userfiles/file/nilinepi.pdf In PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7906a208dede144b154b390b44c99093/63449701625.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/mopopuzemibiz.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/56761398234.pdfIn PDF document text
    • http://glassick.com/userfiles/file/35629618238.pdfIn PDF document text
    • http://holzbau-napetschnig.at/93844680627.pdfIn PDF document text
    • http://ashioke.com/images/library/File/toruzikamazamudutozusiwu.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/wagimipinaverux.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/xixugibomexigara.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/64642007454.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/82685385627.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/jinifalivuvekevuvowelitog.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/kuterovodisemure.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/mojekofipebe.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/piras.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b54b49ede534def7a2161845db2af8eb/munegaraluzipupumaxadabe.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/13608920370.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/67229379824.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210903011947.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/wowebidotipazufibusejegew.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/53069146434.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/detitefanumaxupase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=psychosocial+development+in+early+childhoodPDF 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_off0000b4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF0 15120 bytes
SHA-256: b7d07a28fec56fbbe6af1deed659e34aeecba53b1d835eb3eeffbc8e70737fcc
font_02_sfnt_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 10960 bytes
SHA-256: a2b7a2647acbc602dde80fa8ab5481e8343f9369a4376863efdfeaaaba57209a

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