Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9778f3949a45806…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 13:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e675f28d609f73f2962a20f9be93ec17 SHA-1: 6b800cf5b822a5e360f8a68d3af42b71575ce36e SHA-256: c9778f3949a4580660c4c5f5c377354c9fbb6c705f6f533b92e1d9d8ccce2136
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially malicious websites for phishing or further payload delivery.

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 https://investmentskillsgroup.com/images/userfiles/file/fenadenubuvadawag.pdf
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/30223781287.pdf
    • http://steakclubhn.com/campannas/file/mugozesakazopade.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d9542e684e3---87035032203.pdf
    • http://geologocarmignani.com/userfiles/files/jidirezetajabivajomexak.pdf
    • http://faradbox.pl/files/file/72296936710.pdf
    • http://gsxr.hu/userfiles/file/70020560939.pdf
    • http://ecovn.vn/uploads/news_file/vudedikexapukuvexebufuket.pdf
    • http://www.vikingmaterials.com/img/lafategedufoporoxibok.pdf
    • https://webvitamin.vn/app/webroot/uploads/files/96709932947.pdf
    • http://bulgankhangai.mn/userfiles/files/8095816097.pdf
    • http://noithattamphuong.com/upload/files/naxasejawimanusezan.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607708d4c720c---86540632478.pdf
    • http://akcjonariusz.com/UserFiles/file/buvad.pdf
    • http://italianopizzeria-pg.com/uploads/files/rixusafuwesiwifud.pdf
    • http://peneleos.pl/userfiles/file/rifosizex.pdf
    • http://rideco.hu/upload/file/36105379723.pdf
    • https://ryokanclub.com/FileData/ckfinder/files/20210725_AF1413D55998250F.pdf
    • http://banghetretunhien.com/media/ftp/file/65218617967.pdf
    • http://showpalmedical.com/userfiles/sadovurodemupeda.pdf
    • http://kidneytracker.com/ckfinder/userfiles/files/xelawutinasokurubisegivox.pdf
    • https://ludifrance.fr/userfiles/file/danoritugaver.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/gnug00jah6mvpmegkpqgkmjso1/46680295197.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=abb+watermaster+profibus+manual
    • 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_off0000d655.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD655 16792 bytes
font_01_sfnt_off0000ee6c.bin
4e4041a7ef07b6f646eae2c1b1e06286007c965790eea11037275ab3bff22258		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 10828 bytes
font_02_sfnt_off00010749.bin
e09502d603e2a51056c141a4f7f3b6a87f0e2d33b2126ea0f4cbc44984b7e2ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 18452 bytes

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