Malicious PDF — malware analysis report

Static analysis result for SHA-256 6340c1335aea4673…

MALICIOUS

PDF

89.9 KB Created: 2021-09-09 00:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3150c9e1bae1b155f01ac51228419576 SHA-1: 793126555fd9d3ee9b46676892bff81605c45911 SHA-256: 6340c1335aea46734809e2fe2324d4388f80387320f9f9c0d40243d8d7e9d078
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF, as indicated by ML classification and ClamAV detection. It contains numerous embedded URLs, suggesting it is designed to redirect users to potentially malicious external sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://speakingaboutnetworking.com/ckfinder/userfiles/files/bazapane.pdf In PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161307996e1356---sukibojok.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89811641143.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/91513745034.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/5260648756.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/caf8eb8770a0be16645203f266279c9d/87769087019.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/bivat.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/92461098568.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/83107084998.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/boniripusufevas.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/62731761359.pdfIn PDF document text
    • http://contextuae.com/resimler/files/78031495869.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/1469518910.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/39033489742.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/3560882895.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/64455900670.pdfIn PDF document text
    • http://nut-shell.net/upload/files/pokipivofajexamenivozowe.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/gonozegozovexorepa.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/bubenatofajoji.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/sutixatovosaveju.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/91302214775.pdfIn PDF document text
    • http://staropolski.net/Upload/file/6143180684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gundam+wing+watch+onlinePDF 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_off0000f906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 19000 bytes
SHA-256: 7614da5da16f2ba5fa645acf6a2448ff235735c93ce9bfba02f061a8495e9f28
font_01_sfnt_off00012982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14199 10772 bytes
SHA-256: ea7cf54fbcc30053caa0667bcbd2a25ba3e4e85081750650d335ea9ca11dabb0

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