Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0e0be1bb1aef53…

MALICIOUS

PDF

82.6 KB Created: 2021-03-30 18:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57caf492d758a3906b325bbb067983f3 SHA-1: 2c76ba0ba24938c1ee0b295c1b494505e80d5d86 SHA-256: 5b0e0be1bb1aef53d5ccbe6f37da7630bcda6d0044677325ae53512a5080a67b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links, a technique often used for SEO poisoning or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of multiple external links, including suspicious domains like 'jumiwimov.ru' and 'medolufinumul.sportsontheweb.net', suggests the primary goal is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=tascam+dp-004+digital+4-track+recorder+review
    • http://medolufinumul.sportsontheweb.net/pdf_burdah_imam_busyiri.pdf
    • http://lnstagram-blue-badge-form.com/acer_x233h_refresh_rateblmy9.pdf
    • http://vostokzapad.su/42946819388ym529.pdf
    • http://vutisonoj.sportsontheweb.net/the_analects_book_4_summary.pdf
    • http://favunewesazut.sportsontheweb.net/12v_battery_charger_circuit.pdf
    • http://boforotaje.mywebcommunity.org/5017528686.pdf
    • http://fb-ig-violation.com/74631926732e6g2p.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f939db32-4d07-45e1-be3a-fab5276ccf0e/fonupox.pdf
    • https://s3.amazonaws.com/toniseligiwuzux/8443724054.pdf
    • https://uploads.strikinglycdn.com/files/7e0d0e50-9f85-4125-a020-220664978fc7/fubivitufolugazomomawe.pdf
    • https://4916de45-aa27-423e-bd90-e4b138126832.filesusr.com/ugd/7e0eb0_83d2423fba8f427aa0b420e69bb4be79.pdf?index=true
    • https://s3.amazonaws.com/lakujusitejojet/minecraft_skins_mit_cape.pdf
    • https://uploads.strikinglycdn.com/files/b51979de-15b2-48cb-8e14-dbffb6ec3957/97260892005.pdf
    • https://s3.amazonaws.com/jagux/2019_calendar_template_google.pdf
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_095e9127465c4433b5d895173f1a78de.pdf?index=true
    • https://s3.amazonaws.com/wewuxuviwar/advanced_excel_tutorialspoint.pdf
    • https://s3.amazonaws.com/tixeligufokup/chennai_express_tamil_songs_kuttyweb.pdf
    • https://s3.amazonaws.com/muxozuvalubi/ritegiwavibudux.pdf
    • https://s3.amazonaws.com/nazekisigiduz/libro_de_sueos_borges.pdf
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_f280f1af54394b61ab0f0030b9840f74.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4767550f-a406-4bcc-8495-ef60637915f2/cant_connect_to_wifi_repeaters_192.168_address.pdf
    • https://uploads.strikinglycdn.com/files/b927b202-9148-41b0-bb72-9ba842d8ccdb/dell_optiplex_760_graphics_card_driver.pdf
    • 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_off00010287.bin
cba9f4b05b889d35c282aac79a376f2515773dc42915a81b1dbe12276cb9ebe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 5820 bytes
font_01_sfnt_off00011662.bin
8bfe377fd5a4daffe81a2bf4eada919a878be7ecfa9ba622631f92b9c5be2c61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11662 11332 bytes

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