Malicious PDF — malware analysis report

Static analysis result for SHA-256 b954ebfb59ff19ad…

MALICIOUS

PDF

78.4 KB Created: 2021-03-16 22:16:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e87cfe54e3973ea294279689bbf7f7b3 SHA-1: 79f085b06459da269dbc35a16c13bbf7e68a1c32 SHA-256: b954ebfb59ff19ad07775e1708567c7ddbe4726dd209e576c9dd04872aff404d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/award?keyword=weak+acids+and+bases+pdf
    • http://takatoruwiseki.iblogger.org/4790703280.pdf
    • http://vujudizega.22web.org/professionalism_skills_for_workplace_success_4th_edition_download.pdf
    • http://jopkapopka.online/dawojapiziwutogerurijeteqdrev.pdf
    • http://trellos.fun/9025228375qz7c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kuxogazixup.rf.gd/chime_master_manual.pdf
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_969a4abcfad147fe9e5d2b20380a7e8e.pdf?index=true
    • https://b23ebcb4-2e41-4c68-a408-584c84124782.filesusr.com/ugd/5a2446_7de08741b9ff4692af42cb60f9c36fad.pdf?index=true
    • http://zoletafexogixa.epizy.com/41013501064.pdf
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_e78ad1952af84dbfbe8a0c118faf67ed.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7685076b-3a75-4b4c-b4ec-0dd82dc04ac5/what_is_the_best_brand_of_fridge.pdf
    • https://uploads.strikinglycdn.com/files/9d867080-2cc7-4c6c-80b7-2021f8809fef/where_is_the_filter_on_my_samsung_top_loader_washing_machine.pdf
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_d479017214a64e4cab3429cd87d2a20f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b4da1af4-8f27-4ae8-b708-99167b4eb056/sumadovikasuxis.pdf
    • https://uploads.strikinglycdn.com/files/ade577d3-1b98-42bb-92cd-528b6d8942b3/14210830185.pdf
    • https://uploads.strikinglycdn.com/files/0a3c737e-81ec-48a9-b747-8de5499d4ca0/tubelesubexojokazup.pdf
    • http://jekutekovemimav.rf.gd/59966074757.pdf
    • http://dazotetitow.epizy.com/xivujakor.pdf
    • https://uploads.strikinglycdn.com/files/2b8ab7ba-6c5e-4f42-84fb-ef294b7651b7/11269108945.pdf
    • https://uploads.strikinglycdn.com/files/d44d5a68-687f-4a5f-b152-20aa176b71f0/can_i_teach_myself_college_algebra.pdf
    • https://uploads.strikinglycdn.com/files/33767ed8-3b06-4685-a11b-f9e45290692c/52190148488.pdf
    • http://sibovup.epizy.com/gevajuporero.pdf
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_495a649560a44710a3dff8132ac72cf9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/333796ec-d7c5-49d4-a736-89e7772e3a60/wordpress_admin_login_page_not_showing.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_off0000f7e3.bin
e18d8268c2016ae86fa9c39abf24bbc0ad47c1c4951a163a3a44d893f124d917		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 5240 bytes
font_01_sfnt_off000109da.bin
bde09dedfc009e3c7d28fab9f1d43093f6fe3ec6158729fcf109403fd2b7e64b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 10152 bytes

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