Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7e0ae8e6f37b9b…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 09:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71eff1545f647b6b9e32f8dcaf4476f7 SHA-1: 9d5b69cc326a2fdd2da15db7c58ca2602796fe2a SHA-256: 2c7e0ae8e6f37b9b13411ac3ac5a9b54a7d8c4c154aa48a9137ac943b6750066
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. The presence of embedded JS suggests an attempt to exploit browser vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://clubon.top/uploads/files/44090961950.pdf
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/sifokixitib.pdf
    • http://spostojow.pl/userfiles/file/52660794519.pdf
    • http://giovanninociti.com/userfiles/files/69873207094.pdf
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/kibikutivogujajadod.pdf
    • http://samtekelektrik.com/files/fufavuroxamavakeraje.pdf
    • https://cottonweb.net/userfiles/file/96896915384.pdf
    • http://atanasijornet.net/uploads/ckfinder/files/vepogamujotetobepivudikeb.pdf
    • https://cepatdaftargroup2.com/contents/files/kupolunopudutilat.pdf
    • http://chukgoobok.com/files/fckeditor/file/30595211705.pdf
    • https://alaqart.atelierleuthold.ch/userfiles/files/samiripatuxinixolopufego.pdf
    • https://mmrh.myagenda.cz/pictures/editor/files/39921954443.pdf
    • https://vidaleve.ind.br/ckfinder/userfiles/files/zumajavepewizasisox.pdf
    • http://freewest.at/86100392422.pdf
    • https://perfecthospital.net/ckfinder/userfiles/files/799647361.pdf
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/tebabu.pdf
    • https://krafteco.ru/uploads/files/79879887110.pdf
    • http://solyaris.pro/admin/ckfinder/userfiles/files/tamivivuti.pdf
    • https://akilanews.com/ckfinder/userfiles/files/6099173489.pdf
    • http://ros-audit.com/i/up/file/33300152496.pdf
    • http://michael-dhom.com/webseiten/file/46509758381.pdf
    • http://sinice-rasy.cz/files/file/bixodofebimupan.pdf
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/19669472008.pdf
    • http://tcsm62.org/uploads/news/file/fulatosinoku.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/e7ilsbqtpvcbb2h1t9dp5o0qf6/59946586485.pdf
    • http://www.fashiongale.ro/userfiles/files/65624734929.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=harry+potter+and+the+triwizard+tournament+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_off0000ec81.bin
e81b0591743f3b6b5858280075cc1ac8ac7c54c3ba0115123732ec2f0e000758		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 16944 bytes
font_01_sfnt_off0001187b.bin
e96c052664925e5f351430ce556ee9cf96ce243f44b569f3451c82cb3a87a6a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1187B 10900 bytes
font_02_sfnt_off0001318d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1318D 16792 bytes

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