Malicious PDF — malware analysis report

Static analysis result for SHA-256 667fbba9883d5395…

MALICIOUS

PDF

113.6 KB Created: 2021-05-30 12:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0370c4ee5c8295253fd0161492e08d56 SHA-1: 4b36c2a8fdf1db730ab0ea4d952788d5fcf7e523 SHA-256: 667fbba9883d5395b7c95749110acf16b1c1c9b5240aa3c349e105c7cdf94451
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, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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 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://xajibur.ru/strik?utm_term=delf+b2+cle+international+pdf PDF link annotation
    • https://lefoteliwe.weebly.com/uploads/1/3/4/0/134095852/xoxarotir_tevus_wewusi_mikisepil.pdfIn PDF document text
    • https://zixobidepupakog.weebly.com/uploads/1/3/4/5/134503699/061b669b032.pdfIn PDF document text
    • https://javesuput.weebly.com/uploads/1/3/0/8/130873829/dozatobek.pdfIn PDF document text
    • https://miwilokak.weebly.com/uploads/1/3/4/3/134375457/6240469.pdfIn PDF document text
    • https://vemusosafuz.weebly.com/uploads/1/3/1/3/131398108/7adada51d4481c.pdfIn PDF document text
    • https://gomopurijovovuj.weebly.com/uploads/1/3/5/3/135390772/a9f27b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464529/normal_604b3043cbf4d.pdfIn PDF document text
    • https://zupevojug.weebly.com/uploads/1/3/0/7/130740492/sowazilejisu_xojeluku_zubif_rubefejo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454051/normal_5fe52dee85545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479917/normal_600be0e997eee.pdfIn PDF document text
    • https://tenipimip.weebly.com/uploads/1/3/4/0/134042327/zajisoziz_tariwuzekakiza.pdfIn PDF document text
    • https://jiburivaduvu.weebly.com/uploads/1/3/4/4/134473865/tipimugo.pdfIn PDF document text
    • https://xujajogasugoni.weebly.com/uploads/1/3/4/5/134514057/modirukigir.pdfIn PDF document text
    • https://zokuwobame.weebly.com/uploads/1/3/1/8/131856234/4122920.pdfIn PDF document text
    • https://levoveto.weebly.com/uploads/1/3/4/8/134897684/semotolanisixo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465147/normal_5fd87659481ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457560/normal_606c030622c58.pdfIn PDF document text
    • https://luvabuzizav.weebly.com/uploads/1/3/5/2/135294148/mesavaguveluwes-wukuju-tuvuj-jafamuvukuvivun.pdfIn PDF document text
    • https://timitadenemegi.weebly.com/uploads/1/3/4/7/134728598/zomesude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486535/normal_5fd1fca26cef0.pdfIn PDF document text
    • https://giwedogifuj.weebly.com/uploads/1/3/4/7/134741463/vifujedagu-xiriziv-rarawose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481684/normal_60248949a0f66.pdfIn PDF document text
    • https://silorofolukut.weebly.com/uploads/1/3/4/2/134265947/a19033e.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
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 35076 bytes
SHA-256: b41fdd9c6bccbef327f79112c41e09d6450ab03ef6c9874a67d266f13d7b946e
font_01_sfnt_off00014da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA2 5028 bytes
SHA-256: cb1a284c270f7a81e76b07efe391ac141cdc08ea078dc29178bb1284686bf0a6
font_02_sfnt_off00015ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EBD 17388 bytes
SHA-256: 55c73888334f243ad6ee9ac70fe0ec801279d3fe0930506b04013fdd8a138b16
font_03_sfnt_off0001919a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1919A 16592 bytes
SHA-256: 77aaf326c667695403b7cf9df05c74aa8d4d55d22fe7864f4f100ae33050220e
font_04_sfnt_off0001a7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7F1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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