Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf785c7176974f7e…

MALICIOUS

PDF

74.6 KB Created: 2021-03-17 06:13:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7a0cb1512e71be27be9b479a51c08f3 SHA-1: e7a4867e11e71e09fed8893b7433a6c909089d72 SHA-256: cf785c7176974f7e387148c2d7ac5bc81dbe0bc4b37d82d5102911f96483dfc2
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The document body, though heavily obfuscated, suggests a lure related to a video game achievement guide. The presence of multiple external URIs and the ML classifier's high confidence score point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dafemum.ru/wix?keyword=mortal+kombat+vs+dc+universe+achievement+guide
    • http://sozimaxetupow.mywebcommunity.org/modern_geometrical_optics_edition.pdf
    • http://lofajemami.sportsontheweb.net/black_and_decker_mouse_sander_pads_wickes.pdf
    • http://rubolanir.mypressonline.com/zizixurinobuzuz.pdf
    • https://cdn.sqhk.co/taranumota/Lbiihau/100_attendance_certificate_template_free.pdf
    • http://aicberg.net/tugoretizemyb28.pdf
    • http://rineset.xyz/92520966758hrdp5.pdf
    • http://newberginvestmentproperty.com/ejercicios_funciones_del_lenguaje_2_eso_resueltosnj6bh.pdf
    • https://cdn.sqhk.co/xapixigu/gewjhif/wixivurowesasosixinap.pdf
    • http://zunuruxeguxifi.mygamesonline.org/adding_tooth_to_partial_denture_code.pdf
    • http://xogavuw.medianewsonline.com/bewovowijufofidup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jumedemimo/avast_virus_definition_update_file_free.pdf
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_a8ca64ae2ae44158b1bb5f83bc92c194.pdf?index=true
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_0e00c5618c004414a467cf290c2ce400.pdf?index=true
    • https://s3.amazonaws.com/kugelilizibuwum/remiwinefov.pdf
    • https://s3.amazonaws.com/midizaxopazeji/html_form_validation_on_button_click.pdf
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_6a4e6b0d43ca4880b2dffa9bc7be2d20.pdf?index=true
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_2d2d4f817178499089942ac50aaec910.pdf?index=true
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_5d26109826b84f999b3d2a7148ff0989.pdf?index=true
    • https://s3.amazonaws.com/fotepopunaj/wiviziraw.pdf
    • https://s3.amazonaws.com/gateme/58965889193.pdf
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_3e23759777804c5196395f1cbdf9d19e.pdf?index=true
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_10bd8e924e344d2896f94f56a64df22a.pdf?index=true
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_b40dffab615c4792844c228936bb276e.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_off0000e586.bin
98d2e948dd2fa121853b621c0ebac52e9fcd1cc725ae113df227a0c55b9145e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 5624 bytes
font_01_sfnt_off0000f885.bin
4b8e436e765f4b64659f640d5f37c87c713ff6ae48de73a7ecc9954565d1151c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 10524 bytes

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