Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18ce0c0af615050…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 04:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fdc5423d7ecbe73bee887940b4605f33 SHA-1: d98c1444ddd317d3f5ec27299bc90390987d45b7 SHA-256: b18ce0c0af6150507790ebcae3a9325e2f73cc185d23a338fbc9b7b7c843da69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external links, many pointing to PDF files on distinct domains, suggests a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the use of disposable hosting and UTM parameters, common in phishing or spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hongphuc.vn/userfiles/file/49743725801.pdf In PDF document text
    • http://betonkeritesek.eu/Content/files/tosujefile.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/40307436494.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/88352573870.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/60769928856.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/donakikip.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/vapigow.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/97556809303.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/15357941885.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/fujarozugus.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/27017836296.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/vokis.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/85495953619.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/66524687025.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/22306755790.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/8097040460.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5cc81224c---porubagafaregiguwoga.pdfIn PDF document text
    • http://31app.com/userfiles/file/lemamifisu.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/pemidisod.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/25435641843.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/75171875616.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/dafeguv.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210907140323_4gst2c.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+send+delayed+textPDF 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_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 10436 bytes
SHA-256: c2fdf05e8eaf909bc0b4e412ae58cebbeb27356fd8e6bfe16bfb979d2766c7d2
font_02_sfnt_off00010db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB5 17560 bytes
SHA-256: 55c80294dab140e08f3b8c9b907cc8b7de276442404b1e983e127994fddf89d6

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