Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72437dacf903cc3…

MALICIOUS

PDF

86.2 KB Created: 2021-05-17 06:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4a92a5541d5da0ea1f46cecca1d7c60f SHA-1: 24535e088c092f772ba73c8174fa14b1f0523bb3 SHA-256: f72437dacf903cc353ba2cb367377d6f6c732d7787d4604ce426817a5fa16b8f
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The PDF's structure and embedded content suggest it is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=determine+the+reactions+at+a+and+b+on+the+fink+truss PDF link annotation
    • https://cdn.sqhk.co/wenejusuzixe/jcjfl0t/99135128342.pdfIn PDF document text
    • https://cdn.sqhk.co/lagolipumepi/fhdChgh/best_car_driving_city_game_android.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/humanistic_theory_psychology.pdfIn PDF document text
    • http://leledup.mypressonline.com/telujurolimam.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/gimgjgc/house_party_fortnite_code.pdfIn PDF document text
    • http://valuburikodajad.medianewsonline.com/gegapexanofe.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/mudale.pdfIn PDF document text
    • http://juvizex.sportsontheweb.net/93269990747.pdfIn PDF document text
    • https://cdn.sqhk.co/tekunipifob/d9hfGpF/felalewikimulanuzukamo.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/d77ecd9e-01c6-4d11-9279-4b6c45cf7a99/81758368205.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/samsung_refrigerator_control_panel_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cf0f0a8-c741-4a06-be4b-2db986d0367b/onn_universal_remote_codes_for_magnavox_dvd_player.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/066d1248-ab65-4c10-94df-f8c08acd36cf/nagimujodi.pdfIn PDF document text
    • http://tudixuzaw.onlinewebshop.net/40332916755.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/xekipetotatemidipizasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8765860-3935-45e1-845c-b1abbc4bd680/41131628675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3bad6c4-2590-446e-a8a0-4073f830b4cf/whirlpool_gold_series_dishwasher_start_button_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ad2518-fdf1-4ec0-8141-64e3d0d7dddb/what_is_the_importance_of_qualitative_research_in_nursing.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/61000355681.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_off00011273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11273 5432 bytes
SHA-256: 9aba1ed4e7192c97022499557a2b6668883a1f035b53005dac8fdfb9efd85b22
font_01_sfnt_off000124c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C2 11144 bytes
SHA-256: 7ce1db889aa72549863bf154ea1e1ff90a762802d075035fd84282ebb7c52d26

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