Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3663beb55ae89b2…

MALICIOUS

PDF

83.9 KB Created: 2021-04-28 05:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1c937213e95bb6d2abba7ffa73f7ffd1 SHA-1: 729fb061fa0a66affcc386b4a6fc8275d9d56539 SHA-256: a3663beb55ae89b2e7423af54b6c5c2a6abc46b6fb0564c94d2bf65694bdba03
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are associated with link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious content. The document body, though heavily obfuscated, contains text related to 'employee training and development pdf', likely a lure to encourage clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=employee+training+and+development+pdf PDF link annotation
    • https://cdn.sqhk.co/dorusafe/jjg3jeD/15822171099.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/pegasus_shower_faucet_repair.pdfIn PDF document text
    • http://mepamoso.sportsontheweb.net/nickel_cadmium_battery_advantages_and_disadvantages.pdfIn PDF document text
    • https://jezemubo.weebly.com/uploads/1/3/6/0/136094449/jojurimuzimodudur.pdfIn PDF document text
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/dfca5.pdfIn PDF document text
    • http://vonexalux.sportsontheweb.net/ct_teaching_manual_a_systematic_approach_to_ct_reading.pdfIn PDF document text
    • https://woduluzotuni.weebly.com/uploads/1/3/4/3/134373450/de7da.pdfIn PDF document text
    • https://cdn.sqhk.co/danopefasuf/hjhiLGn/marine_turbocharger_diagram.pdfIn PDF document text
    • https://cdn.sqhk.co/veladaxuzeba/Sr2jaRD/movistar_play_descargar_para_smart_tv_samsung.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/imMxMLG/zedge_app_download_location.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/QYAnhgj/platform_bed_frames_full_size.pdfIn PDF document text
    • https://basisini.weebly.com/uploads/1/3/4/7/134775363/ninimapexu-sukabunidug.pdfIn PDF document text
    • https://zukikopan.weebly.com/uploads/1/3/0/7/130775822/ropomedewuw.pdfIn PDF document text
    • https://wunurobi.weebly.com/uploads/1/3/4/8/134881210/9f031530f5928f.pdfIn PDF document text
    • http://berasowugixo.mywebcommunity.org/22262170418.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/97f75504-cb14-4811-a6b9-d953e538b7c9/fisher__paykel_icon_novo_cpap_with_humidifier_4.7_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/882b85ba-c609-4556-83e3-22f8949a3bf5/75708690675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9a8562e-6380-4f28-8d6b-c6c0f3d5649a/chaos_knights_40k_codex_vk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65a5ad84-f11b-40f5-ae3d-4d527c0be8fb/is_defending_jacob_only_on_apple_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33869d0c-d52b-45c1-aad7-eb10c312bb56/16529112573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc76a933-8bf1-43fe-86bd-43dc99151ae9/sasuwulenono.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 5304 bytes
SHA-256: 8bdc82a4bd5ca8c587ca2be214024866892f779e473e10dbeec09378be424767
font_01_sfnt_off00011bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDC 11380 bytes
SHA-256: ce5689757126dc48256ccd470432938d0fb03783f633be48618cd1d5a276b49a

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