Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aeb4824eaff68a5…

MALICIOUS

PDF

76.0 KB Created: 2021-05-17 10:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: baae4ab1f4018c67112131c1f24cc2fa SHA-1: 5afa810d06f2d7057c86bffed5d3fa1f1a325f3c SHA-256: 0aeb4824eaff68a5bdf3204f438e91969de9e8e1781aa90895a3db1253efbc53
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 0.9990

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://jacksth.ru/strik?utm_term=creativity+flow+and+the+psychology+of+discovery+and+invention+summary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455886/normal_5fcdafcd29960.pdfIn PDF document text
    • https://jotafeke.weebly.com/uploads/1/3/4/0/134096025/4bb0880fb4.pdfIn PDF document text
    • https://radufogerexe.weebly.com/uploads/1/3/4/2/134265868/ninugu.pdfIn PDF document text
    • https://fepanaxowa.weebly.com/uploads/1/3/4/3/134311119/libufelupavozi.pdfIn PDF document text
    • https://cdn.sqhk.co/marezotije/j6YUAVo/dungeon_keeper_gameplay_espanol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460471/normal_605705627247b.pdfIn PDF document text
    • https://pizotiwedif.weebly.com/uploads/1/3/4/8/134868845/luvasefelexud-dogedadasele-feditidufom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407571/normal_6058955582637.pdfIn PDF document text
    • https://nakabupibuf.weebly.com/uploads/1/3/4/6/134608610/gavapudebevo.pdfIn PDF document text
    • https://cdn.sqhk.co/resesexiraf/6Jhgrjg/6971562692.pdfIn PDF document text
    • http://gazorowegesejix.22web.org/estrategias_de_afrontamiento_ante_el_estres.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/23072.pdfIn PDF document text
    • https://gemonozuwusub.weebly.com/uploads/1/3/4/1/134131657/0026abcdb.pdfIn PDF document text
    • https://gonalibage.weebly.com/uploads/1/3/4/6/134652093/guvapuf_masazul.pdfIn PDF document text
    • https://dekomowunine.weebly.com/uploads/1/3/4/6/134638227/2d8463d90223cd.pdfIn PDF document text
    • http://potoborotagivud.22web.org/beaver_lake_trout_fishing_guides.pdfIn PDF document text
    • https://kimilofu.weebly.com/uploads/1/3/0/8/130873947/4d855a4.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/idjjhj5/real_driving_sim_hack_apk_obb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_31a50d8ca800412eb7bb208deaf297ce.pdf?index=trueIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_ab415e1e7cd74e548430131db4e810a8.pdf?index=trueIn PDF document text
    • http://joketatam.epizy.com/como_sembrar_aguacate_hass.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_f319136433f0488dba4541d3f2361709.pdf?index=trueIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_e1fb1b363ae942b691760cefe1c27be9.pdf?index=trueIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_b4698b2df54349cfa84f919c79e6ee66.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_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 5728 bytes
SHA-256: 66506fef08492c06c2d8540831b3e51c0907bf14cc91fc9baf9cb83339d289d5
font_01_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 10200 bytes
SHA-256: 16370a7120549ef9500e3c2e1decc9aa833c9644b61e2d0677d071eec442ced5