Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9670b74234b560…

MALICIOUS

PDF

70.3 KB Created: 2021-09-13 04:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e8996a04eded6411c68c231d7128dc6d SHA-1: 08bb872797fb1aefa62403e5e8eb7e9813d53a94 SHA-256: 8f9670b74234b560605f4c25ce61bd4295164b541de2821b7f4c7413e5bccec4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, and numerous unknown URLs were extracted, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/s7jvcr4aok4p87lr8fduvh0ucr/37524262393.pdf In PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naledinovulabititidano.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/75878192649.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/11134518846.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/34440884023.pdfIn PDF document text
    • http://atrsara.ir/resource/files/31353084839.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/dugimagubazaxijari.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/biromidu.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/zusajuragixetiw.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/57120200405.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/65722834648.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/65140114122.pdfIn PDF document text
    • https://anup.bo/images/files/jobugim.pdfIn PDF document text
    • http://come2menorca.com/images/file/rafepid.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/68458807917.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/82578230722.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/17502354393.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/55800736149.pdfIn PDF document text
    • http://becucci.it/userfiles/files/39497620624.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/25920481565.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bfaf37dab---towaxuniziri.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/71060501675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=quoridor+rules+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_off0000b538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB538 10284 bytes
SHA-256: 37fda4122b3c76b19b85407880b5cd7926e0fd85d7c6323aa8dbcd7ef14fb130
font_01_sfnt_off0000cc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 15460 bytes
SHA-256: 079d5b20d87b5345895b4c08a004a6e0a1849e0c852b53ec9d16c104314c65ba

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