Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfda69962edbd346…

MALICIOUS

PDF

67.8 KB Created: 2021-09-25 00:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 398afb2e993b34880a192f46989a877d SHA-1: 21aad93769fc482074f8a99ed1fbe07f3c607c99 SHA-256: dfda69962edbd34641c9d87eaeff5e3fcd4c817fe37d4cbe807613abdcab71dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://msinziniering.com/userfiles/file/sololowaporekeniz.pdf In PDF document text
    • http://studiotecnicopinto.it/userfiles/files/4531917495.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/fogewuwib.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/26296029094.pdfIn PDF document text
    • https://sergiomauri.com/images/file/gixasazavovinudijelir.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161424bb7eea81---44884027545.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/82237413316.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/26083787286.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/tuvipozabujanaput.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/xokiniloratazavemi.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/54016667982.pdfIn PDF document text
    • https://ubranni.com/uploader/files/mozeleguzutilawexevogukib.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/mitijejikebisob.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/79616178273.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/marowuvasejopojonig.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/majozefabevukupe.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/ruretomefexabij.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/segamapunexas.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630944540.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/kukuzasoxujulimox.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/71673118210.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/besokokirijidoluwuxekeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=best+nes+romPDF 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_off0000ade9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE9 10024 bytes
SHA-256: 06b7a420028b321120066755667c99c63c0a5ffad798220f5992c5a9385ad645
font_01_sfnt_off0000c42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42A 15120 bytes
SHA-256: 93483f274580773a8d24cb7a84cbe52e570136c567be78549963adf155109b97
font_02_sfnt_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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