Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c27093b3b0b511…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 01:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ad3c21a980edc1109aad6abf60d8140 SHA-1: 03772a75bdffa1f4db856b22192aadf9eae9db29 SHA-256: b4c27093b3b0b511f87f1fd08233f3e36d5bf10d2f100e14124c45d5860cd9e7
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 link farms on disposable hosting. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing and trojan activity. The embedded JavaScript likely facilitates the execution of malicious actions or redirects to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=illustrated+harry+potter+pdf
    • http://cofetariafraguta.ro/UserFiles/file/ziwatebudamalabulixev.pdf
    • http://ilturismoinitalia.it/userfiles/files/54144016067.pdf
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/37512228335.pdf
    • https://hohsingfiber.com/ufiles/files/65367611588.pdf
    • http://ilovehikari.com/uploads/files/11549378388.pdf
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/lavavesozosedadapi.pdf
    • https://madspot.dk/ckfinder/userfiles/files/20767750251.pdf
    • https://excellencetogether.com/img/files/file/jurunerizowulibalobisimi.pdf
    • https://keiba-like.biz/js/ckfinder/userfiles/files/28668966700.pdf
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/libobaxawawevusilisoge.pdf
    • https://jecoexports.com/ckfinder/userfiles/files/35959120937.pdf
    • http://maksimetall.ru/files/noxovexedojuzejuduxomomi.pdf
    • https://pachetedeturism.ro/images/files/ziwob.pdf
    • https://trimix.bg/UserFiles/File/vitinifigokuvebe.pdf
    • https://rosenstein.lu/userfiles/files/poxajeko.pdf
    • https://parisnordmedical.fr/docs/file/65303699248.pdf
    • http://videocycling.info/files/file/menozepurewo.pdf
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/mumamukexogixex.pdf
    • https://psystat.net/candyticket/uploads/page_images/files/12875085622.pdf
    • http://globalsublimation.net/uploadfile/files/fekineteze.pdf
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/nefawevagobiwo.pdf
    • https://apra.pl/files/file/zidurulovufibetusugo.pdf
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/batawesigodevusa.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_off0000d38d.bin
2f3ed853342e49eea63279a8f5936bb5bb8c99825828d5928cc1b38467d2e102		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD38D 10564 bytes
font_01_sfnt_off0000ebd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 16792 bytes
font_02_sfnt_off000103e9.bin
da127aefd1b6d4ddb08062393dadaac3c431ea22f8730bf82c71802b4af11e86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E9 17564 bytes

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