Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d013c89e26e31c…

MALICIOUS

PDF

89.1 KB Created: 2021-09-12 02:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89826f8d627f80c00d4dd2aa9fc20900 SHA-1: 897b880a1e256071e13bb05f4dcfd2a2fe604a1a SHA-256: a0d013c89e26e31c2f4101da0be1e6c7b98b9d91e5afc264a7002df182f269b6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=kuririn+and+android+18 PDF link annotation
    • https://resortweeks.pro/userfiles/file/57777744747.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/wepafakagumijajumo.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/kisas.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/94522118922.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348c2c4dc4e---88902950695.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/podobowabazanofuzapifusat.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e331784bb5f882b44c6a1eaaf5d67fe3/20803350085.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/vifiwirologu.pdfIn PDF document text
    • http://deltools.com/userfiles/file/wurik.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/kenafapilanu.pdfIn PDF document text
    • http://workontext.ru/media/file/18767664606.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/fezapupovobub.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16312656551195.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/14783061299.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/97223664755.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/rawelukeketuxewoxatifel.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/16290590083.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/muxufimoluragil.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/65197752126.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/87939805584.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/jiwizugavafezalesur.pdfIn PDF document text
    • http://kaies.cn/upfiles/210911135353871720s9winy.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/gavularinuxava.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_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001129b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129B 10148 bytes
SHA-256: 3436e5b94e321e4157643270fc9a6da4a4e46ae120d033a927a948af5f29df46
font_02_sfnt_off00012955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12955 17576 bytes
SHA-256: 149b04a9d984d34b9d4ffbb0ac04c24da4d656ce0db15f4b75b59a8fcfd8c9f7

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