Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb171b2d735ba40f…

MALICIOUS

PDF

89.0 KB Created: 2021-03-07 06:44:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 34fb597a8d8b9f0aa6ac55f8f4c3cd45 SHA-1: fba718efdaec2f145a48b9ff18c2c963972c4eda SHA-256: bb171b2d735ba40f01488a3ac8c441282e2b5bc651d2b844ccc093b46e097016
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm or redirection mechanism to deliver malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a game title, indicating a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/wix?keyword=no+man%2527s+sky+ship+guide PDF link annotation
    • https://cdn.sqhk.co/pugalaleluti/XicpI7z/tenawifipuf.pdfIn PDF document text
    • http://vataponuxizeliz.mywebcommunity.org/roku_error_code_003_comcast.pdfIn PDF document text
    • http://jumbochecker.com/52518410187mfy5c.pdfIn PDF document text
    • http://biniwitovo.mywebcommunity.org/roku_3810r_vs_3811r.pdfIn PDF document text
    • http://morasuxod.getenjoyment.net/27696127734.pdfIn PDF document text
    • http://cafechorsu.ru/surawabusajizevexaxawidi9yvqw.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/giFhjba/s10_stock_ringtones.pdfIn PDF document text
    • http://paruxezogu.mygamesonline.org/80078890079.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/sokozovafawofuge.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/lekevizizep.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/wideralogen.pdfIn PDF document text
    • http://ehaberdevlet.com/jewemegitaparumugixu1.pdfIn PDF document text
    • http://dizititakozazi.mywebcommunity.org/linda_goodman_sun_signs_leo.pdfIn PDF document text
    • http://nuxuzuruguli.mypressonline.com/biroxufagetozuxegodi.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/5x5_workout_program_results.pdfIn PDF document text
    • http://myirn.icu/54688495710wkb57.pdfIn PDF document text
    • http://bezprovodov.guru/tivipoak0g7.pdfIn PDF document text
    • http://prodive.su/jetefetikaguxuny79k.pdfIn PDF document text
    • http://gaydating.world/32023481283aytuf.pdfIn PDF document text
    • http://limecash.xyz/5894460412vuqp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_c04d09e7ec0f47eea7cf368d595296c0.pdf?index=trueIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_8aa70d62583245f488e9f87080e5a84c.pdf?index=trueIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_1a311fb5f296409782b6d6db2dd521e3.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F63 5416 bytes
SHA-256: b295997e8d209f7778a2bd1900333de8c51d61dec90cccc82aa59fa72d4dba3b
font_01_sfnt_off000121b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B3 6148 bytes
SHA-256: 4910d0177da9f60ecc92c13a34fae8c5c38ffafb9e4e22a3c3fd987548b79157
font_02_sfnt_off00013194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13194 10776 bytes
SHA-256: fddbdb2433963cd7a7452a7d2841fd0499860adf5076abc8cafd24c235d08ed9

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