Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c62fe90fdffeb80…

MALICIOUS

PDF

96.0 KB Created: 2021-03-01 23:41:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0752060c9d4a2c5eb2e221a9d05b8071 SHA-1: e9e496c23a29ef83eac83bf3afa7742872f20872 SHA-256: 4c62fe90fdffeb802f649b2996b4dbb1a967b94bec7568b5b111a2da816a22c5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution 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, many pointing to disposable hosting, and exhibits characteristics of a link farm designed to redirect users. The presence of external URIs and the 'ML_NYX_PDF_MALICIOUS' heuristic strongly suggest an attempt to direct users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=html+table+tags+with+examples+pdf PDF link annotation
    • https://julalawigito.weebly.com/uploads/1/3/4/8/134869680/pujufogigojofalilin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487626/normal_5ff7a404d9d60.pdfIn PDF document text
    • http://imedo.ru/855322687056ta05.pdfIn PDF document text
    • https://cdn.sqhk.co/kadunila/7Hggjfr/maxibitigariwusodu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383798/normal_5fe4ba2ec08c0.pdfIn PDF document text
    • http://sodahub.pro/hola_vpn_for_laptopeiieh.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/smart_board_online_activities.pdfIn PDF document text
    • https://panikudar.weebly.com/uploads/1/3/1/4/131437701/samisivefi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391642/normal_601449e906bd6.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/NqAhgUY/orange_peels_save_rainforest.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/gchjih6/99640072146.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_602478c67a815.pdfIn PDF document text
    • http://disconto50.info/any_video_online_url_iphonem1535.pdfIn PDF document text
    • http://zibepifutidi.sportsontheweb.net/monitor_27_led_asus_ips_mx279h.pdfIn PDF document text
    • http://delinapod.mypressonline.com/bibosuvowulafapefado.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/how_to_reprogram_my_car_starter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuxemozoxabonag.onlinewebshop.net/how_to_program_a_universal_remote_magnavox.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/renuvumujutexovav.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/xisojedunulipiluri.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/hp_designjet_500_printer_plotter.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013c1a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13C1A 29888 bytes
SHA-256: 0284eb8e1ea43bbcba77f4b6b3e3dde915ad05f8fa6b801bb975111985618cca
font_00_sfnt_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 2872 bytes
SHA-256: 321218067013d167bba8a76caf5c9675a5cd7355da82d397b62bb6a72a9beb40
font_01_sfnt_off0001046d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046D 5620 bytes
SHA-256: 1dceb8878383a2f228fdac27d05a06dd371e235ca61aef56506e567094591944
font_02_sfnt_off00011773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11773 10640 bytes
SHA-256: d63d1b3a20889e7c4fc4c7861744874f5953fb1e889be09a31fe380ab22db3fa

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