Malicious PDF — malware analysis report

Static analysis result for SHA-256 439461b2c78f7c87…

MALICIOUS

PDF

78.7 KB Created: 2021-03-25 13:14:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1796ffe7976dc30b465da09d91ad13fc SHA-1: dc0734c1e8793c8e73788eb7d4b90afa149ff5b5 SHA-256: 439461b2c78f7c879501dbbe12d52d51d486b6337775f1c2f162276bf25b1dc9
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, likely to facilitate phishing or malware distribution. The presence of embedded URLs further supports this, directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=hansel+and+gretel+2020+rating
    • https://cdn.sqhk.co/lewikokezina/jkT2icl/keferodikikajexumit.pdf
    • http://puviwaxeraw.22web.org/60879800497.pdf
    • https://cdn-cms.f-static.net/uploads/4389601/normal_603960d5197f1.pdf
    • https://gekaketiba.weebly.com/uploads/1/3/1/4/131455198/a1c19b.pdf
    • https://cdn-cms.f-static.net/uploads/4458615/normal_602382b92af9b.pdf
    • https://pupazugosabi.weebly.com/uploads/1/3/4/8/134868946/maxivifazezij-poked.pdf
    • https://barezixajeg.weebly.com/uploads/1/3/4/3/134318527/xelibiluj_winusaru.pdf
    • https://cdn-cms.f-static.net/uploads/4451225/normal_605856f1356cf.pdf
    • http://lawobulobatidu.22web.org/upsc_me_ani_tumhi_ansar_shaikh_book.pdf
    • https://cdn.sqhk.co/safimowexaw/YG6MFqa/spendee_apple_watch.pdf
    • https://cdn.sqhk.co/zolewiko/dqTicgh/1434204706.pdf
    • https://sepetumeba.weebly.com/uploads/1/3/4/6/134601334/6312969.pdf
    • https://cdn-cms.f-static.net/uploads/4367911/normal_5fda8f6a58fb6.pdf
    • https://cdn-cms.f-static.net/uploads/4387920/normal_5fdc030f39e1e.pdf
    • https://cdn.sqhk.co/zabeluzitema/tzFigpF/racing_moto_download_apk.pdf
    • https://cdn.sqhk.co/gepeduvo/chdiflv/forest_wallpaper_for_pc.pdf
    • https://zanixikowupu.weebly.com/uploads/1/3/1/4/131437740/puvalamezas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_e139623327414e9a97c12f38d65b3c6c.pdf?index=true
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_50131986138c41aca91cc3b1d0b7f57a.pdf?index=true
    • http://lakugarim.rf.gd/android_9._0_apk_not_installed.pdf
    • http://mibelajute.epizy.com/ios_xr_firmware_upgrade_guide.pdf
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_0b756c1fdc664765a083e95e6ede63f4.pdf?index=true
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_0858d6864df74a5b8e2e3156164daba9.pdf?index=true
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_81354cb18a6e479d85f44f0b2c44036e.pdf?index=true
    • http://nekaluro.rf.gd/narogunubome.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f50e.bin
db539e80e923be351db078153f27e8a86377ffc654d2798aa3fe89254e10561b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 5228 bytes
font_01_sfnt_off000106dd.bin
2da0489f77144d6bee806094ab3c0203bdf194ed0d018b40a2e81a0f41aae1ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 10760 bytes

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