Malicious PDF — malware analysis report

Static analysis result for SHA-256 7723a8b0aeb6970b…

MALICIOUS

PDF

185.1 KB Created: 2021-05-17 16:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a5c4641c7abbf0d5c686c22c67924941 SHA-1: 8e0ff0593542ce7ced978fd5ce8675f3c7a7f7ba SHA-256: 7723a8b0aeb6970ba6e6d56d64280b28302349572b0e36649581b22862f90b1a
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external URIs, with one specifically identified as a redirector likely leading to malicious content. The PDF's structure suggests it functions as a link farm, aiming to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://jacksth.ru/strik?utm_term=adam+clarke+commentary PDF link annotation
    • https://solekavugixe.weebly.com/uploads/1/3/3/9/133999951/058c804aa1cd8d3.pdfIn PDF document text
    • http://apkweb.net/enoch_powell_rivers_of_blood_meaningnc0yx.pdfIn PDF document text
    • https://xofenozupe.weebly.com/uploads/1/3/4/5/134500057/fekimakerozaburunimu.pdfIn PDF document text
    • http://nuveclovet.xyz/13372831855zsmt6.pdfIn PDF document text
    • https://cdn.sqhk.co/logulemuset/e1ghjhb/luwexosawepijop.pdfIn PDF document text
    • http://jobauthor.online/deductive_or_inductive_reasoning_persona_41nds6.pdfIn PDF document text
    • http://fitdieta.com/lajizazujxq1j4.pdfIn PDF document text
    • https://texanajak.weebly.com/uploads/1/3/4/0/134018539/3a182e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386618/normal_5fe420f85ddb0.pdfIn PDF document text
    • http://texno3ua.com/5093982713764j5h.pdfIn PDF document text
    • https://cdn.sqhk.co/libudezetuv/GghTgcn/tirefixuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466408/normal_6045b95096a2e.pdfIn PDF document text
    • https://vemisalisak.weebly.com/uploads/1/3/1/4/131437925/rovijo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a3c73713-be4b-4c8d-a01f-dab92ecb4e1a.filesusr.com/ugd/5df860_965675adb0714aa686c3c6a248867aec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4656797-235f-4912-aa61-b10bb7df39c9/nelson_mandela_books_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d11d03-5a01-4578-a635-6097d4a2d754/bebogidadabenokazaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f86b0a70-03c9-4f96-b115-bbab8217d9a8/54703886015.pdfIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_3171198ded12405ea4950164403ab38f.pdf?index=trueIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_c4177b988691416f8ea016f9e691d3ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/042b2868-074b-4dae-bed1-05a1e6e4dd1c/que_hacer_para_calmar_el_dolor_de_cervicales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bd6b01e-2e72-4011-8671-4eb786891564/73140419143.pdfIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_20773473a6154161a48b178c52ecdf88.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00028a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28A19 5064 bytes
SHA-256: c02f6412dd136904f68293b7bb9f8c81f8e4d059e208d03b84d69ed8eb451a8c
font_01_sfnt_off00029b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29B46 10804 bytes
SHA-256: 8aa79b133e06e8e8c054f316c02541ddaa68d8255e962ff13ee9d469651cd62d
font_02_sfnt_off0002c037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C037 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e