Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27e8f9853edcd95…

MALICIOUS

PDF

70.0 KB Created: 2021-09-12 02:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cf8fbd76918e3282b35613f26c45c4d SHA-1: 5e17d090aa4584c7e6895b1781f19649d7d27e99 SHA-256: d27e8f9853edcd95b80e7351c1954744f77c9a5be99086735b973116425d35d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://drafthe.ru/uplcv?utm_term=emoji+my+face+android
    • http://yigang-lin.com/uploads/files/202109030033584103.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b020a5cfc---vuzitejekum.pdf
    • http://sz-nuoyi.com/Upload/file/2021090416535033782.pdf
    • http://lesbambousbleus.fr/ckeditor/upload/files/ropedejibogibijanawuwuvak.pdf
    • http://geologocarmignani.com/userfiles/files/zopofonabemef.pdf
    • https://lideregitimpaketleri.com/calisma2/files/uploads/90888154601.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ni9aq9mgvdconf7tsnci0dgp90/4875495741.pdf
    • http://4998horo.gmmwireless.com/contents/files/24650415512.pdf
    • http://odontoflash.eu/userfiles/files/zujexe.pdf
    • https://partetesal.ir/data/file/45870260141.pdf
    • http://cobmedia.hu/include/27816017960.pdf
    • https://winpoasia.com/ckfinder/userfiles/files/8219509072.pdf
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/55356510654.pdf
    • http://happyorderfood.com/uploads/files/luzomudikemo.pdf
    • http://kastely-vacduka.hu/fileok/file/1275133391.pdf
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/19516172371.pdf
    • http://erulingua.hu/uploads/content_files/files/bubomazinewefevagexaz.pdf
    • https://behbehaniprojects.com/uploads/files/jekojipagexukepakoru.pdf
    • http://studiocinti.eu/userfiles/files/mixopukuvukegiz.pdf
    • https://beta.nhatthiengroup.com/files/uploaded/files/batamunovudedeke.pdf
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/62597850295.pdf
    • https://fotofidelity.cz/userfiles/file/tizire.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/miboxeroxewusilibew.pdf
    • http://skulpt.in/admin/uploads/file/tupesugawafezozidu.pdf
    • https://spyboarcams.com/files/muvux.pdf
    • https://medbillings.us/lightspeedweb1/file/fafugawufugitasuzozukaw.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_off0000b618.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB618 16792 bytes
font_01_sfnt_off0000ce2a.bin
af9d1db5b83526a3817f93c384041ddb01a0b3ad4ff34ab14234de24ac5f5ff8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2A 14532 bytes
font_02_sfnt_off0000f227.bin
4835408a3e58b102a91b5cca8b33a8e7584bac5ee48256aebad2a21070ad99cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 10552 bytes

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