Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf7ab3073475aeb…

MALICIOUS

PDF

79.3 KB Created: 2021-03-24 11:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a289d4a8614f35da068a69cdecde684 SHA-1: baf1dc8413b4ade9771fbc1aaf33c5fe46127d15 SHA-256: 8bf7ab3073475aebed782e26c36be7e0c064399847e5a33b12dded5e98fa4395
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, with one prominent URL related to 'clash of clans cheat server ios'. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or phishing attempt. ClamAV also detected this as Pdf.Phishing.Trojan, reinforcing the malicious nature. While no scripts were explicitly extracted, the structure and heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=clash+of+clans+cheat+server+ios
    • https://tadeliganunuzax.weebly.com/uploads/1/3/0/9/130969808/6585642.pdf
    • http://naliputa.mywebcommunity.org/braille_alphabet_and_numbers.pdf
    • http://dsv-trening.ru/jenis_kelompok_sosialrylw1.pdf
    • http://todayshop.website/57744326184bpdl3.pdf
    • https://wikafifej.weebly.com/uploads/1/3/2/8/132815388/9767692.pdf
    • http://kasirepimadi.iblogger.org/scotland_short_assured_tenancy_agreement_template.pdf
    • https://malolikekex.weebly.com/uploads/1/3/4/7/134718462/fidiselarixumopewob.pdf
    • http://worldhold.online/hungry_shark_world_game_for_androidsrh9j.pdf
    • http://kpupnov.pro/rpsc_2nd_grade_maths_bookyi159.pdf
    • http://workbykoder.xyz/kofufotexugiwigujc4rxp.pdf
    • http://poputobesot.22web.org/s_kiu_truyn_phimbathu.pdf
    • http://helplnstagramcontact6088756.com/87440757135592sy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_3650a85d41674935a5778c7a06960dd2.pdf?index=true
    • http://botetuvixomidiz.epizy.com/what_is_bank_1_too_lean.pdf
    • http://zisukuvi.atwebpages.com/how_to_replace_cable_on_minn_kota_talon.pdf
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_f12e4a5a56e4467882df9433a22c618f.pdf?index=true
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_9c9aa4febb0c4a708dbc7b519d849763.pdf?index=true
    • 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_off0000f65e.bin
21a0adada068d7211f97d7cbd667b98efd2721c15229f3b7cc427991aea8392a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 4932 bytes
font_01_sfnt_off00010726.bin
01e946fe6d5e5035585f8d0e6f739b2b3aad815e0aba84166b23d35603698805		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 11704 bytes

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