Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb19cd85fc31a2de…

MALICIOUS

PDF

74.9 KB Created: 2021-04-13 15:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 051fafa412a47e376682cbc0f4fcca4a SHA-1: 239ea42bfe1540654b89a9ea5f6819aaa0c8b569 SHA-256: bb19cd85fc31a2de3f5b2fdb20cc6f10d0b505e7e3037d15a22fdf151b1b98a1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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/strik?utm_term=mercury+150+efi+ecu+for+sale PDF link annotation
    • http://xivetaf.22web.org/14239742213.pdfIn PDF document text
    • http://kevikakagax.iblogger.org/django_static_css_template.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/54927084909.pdfIn PDF document text
    • http://fogejebimo.scienceontheweb.net/fakajojidita.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/91ec6667-4c77-486e-9f2c-114958cd7a2b/edenpure_gen_4_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d0c969b-b5ed-4d0a-8569-d869fe684b70/is_alcatel_3v_a_good_phone.pdfIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_ab2fa3bb4f224e72887d0d6ca36fc9d9.pdf?index=trueIn PDF document text
    • http://pezusor.epizy.com/94418551719.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/54801279528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c98ab6d-4b72-4adb-ba7b-e7becb71653f/dell_p2419h_vs_u2415.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/einthusan_tamil_movies_2015_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/83541358502.pdfIn PDF document text
    • http://wipadafefuxasi.onlinewebshop.net/how_to_change_versa_lite_band.pdfIn PDF document text
    • https://9e28b13d-ef5c-4d18-821e-e071a8932918.filesusr.com/ugd/0b0738_c1ab05bbf17f4e27b6fe72b5cd508652.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/74158035110.pdfIn PDF document text
    • http://gemimixobisuju.epizy.com/jopixewiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78f4df84-4f73-461c-a3fb-f90e1761c26e/how_to_descale_the_keurig_k_cafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ffee786-1e6d-423e-bea9-852676417942/how_to_get_password_for_hp_deskjet_2544.pdfIn PDF document text
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_b093fa52dec248efa502548759724591.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e35898eb-bbd6-4994-8c0b-72018800be75/66489161613.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8700e46c-4cc6-4434-b185-f9acddf80896/dewalt_hammer_drill_18v_kit.pdfIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_3bd75518999546e48cf83955b5269186.pdf?index=trueIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_65e00bd3e9b94b8d89a28abe8dc988b4.pdf?index=trueIn 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_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 5300 bytes
SHA-256: e8eb138daafef76e78a326e61af573fa36f75dde74790ac59ea863152e3e570f
font_01_sfnt_off0000fa19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA19 10668 bytes
SHA-256: 9579f8af7b1af64082fb249c74665fc3c900be60859c808b210ce8a97191ea44