Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b12ada71acc407b…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 15:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a6dd5b72fb4d5fb4013ee0958a146c6 SHA-1: eb3b9e33beaab3218324c83a8ae7c22d8df8d48e SHA-256: 0b12ada71acc407bb9ed0b8806fbcc676922ddacf53887ee0037bc2965f0036a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://fitviewer.biz/files/file/diziwaj.pdf
    • http://thanhlapcongtykiengiang.com/upload/ck/files/pulugim.pdf
    • http://cpgny.com/userfiles/files/zenakozenijiwobeb.pdf
    • https://dailyiat.com/html_upload/file/74310695451.pdf
    • http://2safe4u.cz/UserFiles/File/dozedivu.pdf
    • http://kino-cosmik.ru/sadm_files/40941462598.pdf
    • https://fong-cai.com/upload/files/bopewudosanilixosoj.pdf
    • http://ingegnasrl.com/userfiles/files/ripas.pdf
    • http://azs-szermierka.pl/zdjecia/fck/file/10132750118.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1d6366f30---39656433164.pdf
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/vegerixejigiratowigutama.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/11506425799.pdf
    • https://krzczonowice.pl/gfx/file/19605937769.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614b460e5585d---wodovaxu.pdf
    • https://grupa-energia.pl/attachments/file/vumogidil.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/vivurunodel.pdf
    • https://www.alitec.es/js/ckfinder/userfiles/files/melemofif.pdf
    • http://cn-polylysine.com/d/files/55566432957.pdf
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/bokizineresodov.pdf
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/12564436993.pdf
    • http://polipack.ru/content/file/87530817868.pdf
    • http://dsacare.com/admin/uploads/file/wikizireginabekasarotasi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=krishnayan+book+pdf+in+gujarati
    • 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_off0000af2b.bin
d73e915a4759c9b038b4ad02fc49bc665a6c9f79e032005474f248578caa39a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2B 17888 bytes
font_01_sfnt_off0000dc58.bin
2b50d5ac396bea7a7ea85c73a3936cfa77d7b5074bdccac44f02355e3cad78a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC58 11168 bytes
font_02_sfnt_off0000f5f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F3 16792 bytes

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