Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e46d9ac94dbd318…

MALICIOUS

PDF

91.3 KB Created: 2021-10-04 16:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0208aadddffb5bffc160d499752b94cd SHA-1: 072277ce5448f2c6fbce34698028084c1c16986f SHA-256: 6e46d9ac94dbd3182c392412386ce81e33e2c754fc6d36ea6fef2db79b63883f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a high density of external URIs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is a link farm hosted on disposable domains, pointing towards a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=squid%27s+day+off PDF link annotation
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/33991793845.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/86538745142.pdfIn PDF document text
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/ligotavuguta.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/43319387526.pdfIn PDF document text
    • http://marketingnews.fr/images/file/28779127283.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/fikiwanijivugu.pdfIn PDF document text
    • https://showerdrainplus.com/uploads/files/202109301002393351.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159b865c7a23---80137254369.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/40505375201.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210922155424.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/zekazidovem.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/32367659693.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/newedofemir.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/naxajajimifadenowezalosu.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/54696436653.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/xopoz.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/12748359377.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/tosorasawezaz.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/zugaboxomiwovefavot.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/jajikisozusag.pdfIn PDF document text
    • https://mysilofr.mysilo.com/upload/ckfinder/files/favidokusasekis.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/lixojibijun.pdfIn PDF document text
    • 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_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CC 10336 bytes
SHA-256: fdb22faa058bc254ba14bf2ccfd21485ec9ddf0593f4e6c3c871b5152edc009c
font_02_sfnt_off00013114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13114 18144 bytes
SHA-256: 1a55270f40fd092a63bed004d335cefa9923ce6de50d9f52b049f6741ca806bf

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