Malicious PDF — malware analysis report

Static analysis result for SHA-256 a301537c7a2d7636…

MALICIOUS

PDF

70.9 KB Created: 2021-10-04 07:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8ac1782f5dd566ee1a44074ab48cd8c SHA-1: 157c8ed6dd9c036fe2c469033af9a2e94aa492b0 SHA-256: a301537c7a2d7636b1cb4233b7842790e8f590982033eee8e63806110873a86b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious websites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=i+am+the+god+of+hellfire+song
    • https://darkoyunpin.com/calisma2/files/uploads/67283211866.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/74cf600882dd097a729e050eb0ada4de/79226274752.pdf
    • http://kavernoklub.com/campannas/file/87374708600.pdf
    • https://superchills.com/userfiles/file/67104943009.pdf
    • http://revucue.com/ckfinder/userfiles/files/palupemufekosowuwub.pdf
    • http://studio70.eu/userfiles/files/minibofodibimutufavunez.pdf
    • http://charontrade.hu/data/file/guviziwofizoselijolabujos.pdf
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/11053376442.pdf
    • http://jobsandhi.com/uploaded_files/userfiles/files/gapinazizo.pdf
    • https://senegal4d.com/contents/files/kupemepokuferebezinasu.pdf
    • https://paidionresearch.com/userfiles/files/52177789917.pdf
    • https://okud-istra.hr/userfiles/file/77083193488.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/gekuvamarul.pdf
    • https://shibbirs.com/media/files/54833918482.pdf
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/29523837152.pdf
    • https://arendic.cl/files/pewekubuxita.pdf
    • http://nonstopsushi.com/uploads/files/5950793414.pdf
    • https://marathonlaval.com/userfiles/files/pewubosaluregod.pdf
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/vopoxojutuk.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/36465698278.pdf
    • https://aiwcecckolkata.org/FCKeditor/file/18014396020.pdf
    • http://aldo-ins.com/userfiles/file/73271866442.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613edb44ada36---topibu.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/36270799601.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b04f.bin
9b33ef6590e760448d9d7f651e1aa1f14258ace2f286278eca421c39e7f4e89e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB04F 10752 bytes
font_01_sfnt_off0000c891.bin
333b54fd93b34e6320467200cd314882fb9c7ae3c05c4d6d7841e35087dce2f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC891 17944 bytes
font_02_sfnt_off0000f65a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 16792 bytes

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