Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b32f1e8917ef79e…

MALICIOUS

PDF

69.5 KB Created: 2021-09-15 17:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e692ac8c5d280ff499f232336fc21ad2 SHA-1: fcaf322ab868a2e45dc4381c2b5947f006e56abf SHA-256: 3b32f1e8917ef79e1eb0ef56f7f26652156e985e973af9be3897f27b4dbf821e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with a critical heuristic firing for embedded JavaScript. This JavaScript is likely used to download and execute a second-stage payload, as indicated by the PDF_JS heuristic. The numerous external URIs, many pointing to potentially disposable domains, suggest a link farm or phishing attempt, aligning with the 'Pdf.Phishing.Trojan' detection name.

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 http://tongrentangthai.com/UserFiles/file/fobagozonedebasog.pdf
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/37995693849.pdf
    • https://tselectromechanical.com/uploads/CKfiles/files/xatiputis.pdf
    • http://thanhtindesign.vn/uploads/image/files/rivolikudugojopeduxu.pdf
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/goniwag.pdf
    • https://bitree.com/ckfinder/userfiles/files/ripufifarajajofo.pdf
    • https://betalinktech.com/blmedia/file/30454393843.pdf
    • http://habitat3.eu/userfiles/files/40362680151.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a2a2ea2766b69abb94343f3182141d97/18580608425.pdf
    • https://vinacomvietnam.vn/uploads/news_file/fitagamaderovazo.pdf
    • https://dodatnojamstvo.com/userfiles/file/99174263208.pdf
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210914061207.pdf
    • http://rucodelniza.ru/userfiles/file/44898336451.pdf
    • https://magicdiscoradio.hu/userfiles/file/29517992249.pdf
    • http://tchid.net/userfiles/file/94317714651.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/h4olc9hl0j60rtnc2o3ikjt6b4/moxokadiboraroxejeno.pdf
    • https://mi-stores.com/basketballtotaal/images/editor/file/65973769123.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/52127971022.pdf
    • https://mldom.xyz/web/img/podborky/files/doruvuzorow.pdf
    • https://partroyfuneralhome.com/partroy/assets/file/gatanava.pdf
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/sosopivuzunebena.pdf
    • https://bhsbeacon.com/FCKeditor/file/81014521059.pdf
    • http://denetimmusavirlik.com/userfiles/file/vesopubagibipozenotuj.pdf
    • http://quimis.org/js/ckfinder/userfiles/files/wagofavurazi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=picture+collage+apk
    • 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_off0000b26e.bin
d74fdbf7a2a820bcbb04acaa5f7de32a1296b39f6bb4debd1970ce73ce17073a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB26E 14964 bytes
font_01_sfnt_off0000d8af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 16792 bytes
font_02_sfnt_off0000f0c6.bin
94aed9c214e74e3798d0a1a8fc3102f98fd14b193af425cf4125843428341090		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 10468 bytes

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