Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eef142ea5bfe7a9…

MALICIOUS

PDF

83.3 KB Created: 2021-04-01 02:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 03cceab0e50087301b6bc9a8d4915f42 SHA-1: c58a0ddec43e8187234335bd79514baf541955b7 SHA-256: 6eef142ea5bfe7a9b4fbbbd88a44c77e15a64d9946157769847d42a20162925f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains text related to 'cheat any android game without root', indicating a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

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://nipisod.ru/123?utm_term=cheat+any+android+game+without+root PDF link annotation
    • https://vepoxiwoja.weebly.com/uploads/1/3/1/1/131164136/diduredivobolel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460678/normal_60303f06444b4.pdfIn PDF document text
    • http://eeuuurrrrr.space/vivinefuprg8x.pdfIn PDF document text
    • https://kexipana.weebly.com/uploads/1/3/2/7/132740250/2681788.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/dH2IG57/biwikoxusilufoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380214/normal_600512122bb41.pdfIn PDF document text
    • https://pananufizusa.weebly.com/uploads/1/3/4/4/134445813/zejudidoxor_jilitali_xulepaxu_zikebigug.pdfIn PDF document text
    • http://goodnatural.space/nuzobinupigamajosugkk68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471945/normal_5ff50e56f3ee5.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/fkCjgLo/jujifetalemofikujupisujof.pdfIn PDF document text
    • https://menimewutezosel.weebly.com/uploads/1/3/3/9/133997121/9706355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456378/normal_601b3e414939c.pdfIn PDF document text
    • https://zemapefim.weebly.com/uploads/1/3/4/4/134485651/8b6d988df645d13.pdfIn PDF document text
    • https://lufuwoxataj.weebly.com/uploads/1/3/1/3/131379696/8f1b1.pdfIn PDF document text
    • http://igcopyrightforhelps.com/17980690225kte23.pdfIn PDF document text
    • https://sesifubonimexa.weebly.com/uploads/1/3/5/3/135317238/084a041.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/hcDlGjb/getadidode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464053/normal_5fd646886dfc6.pdfIn PDF document text
    • https://xororowikaluna.weebly.com/uploads/1/3/4/6/134643421/pazatireto_wufofuwa_rofelaz.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/jwieifS/gadukujoziwotav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/34447604-5149-4ade-a881-3c9a74de4a71/pizogetag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f282a7c-6e99-4ae1-b83c-df865693df30/xefoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a45b79-b5c6-4113-9ae1-906de96e115a/95165716841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/834af051-fbc3-4d8d-8e88-63353196299e/daxaboxigofufovebinaxe.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1E 5128 bytes
SHA-256: 41741e17890f1b37bf27c5080457c278f7b7cae4c75477526cfb33ca67086867
font_01_sfnt_off00010b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B74 11112 bytes
SHA-256: cb66d97515154ad4ef9eecfbff361b88e9e9822b43d76fa715aeb7282cd9d392
font_02_sfnt_off0001312f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34