Malicious PDF — malware analysis report

Static analysis result for SHA-256 388a9598a4da233c…

MALICIOUS

PDF

78.6 KB Created: 2021-05-23 00:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 350d26423b177653b093d3ca8cac6b55 SHA-1: 3f516e97c90c639c6833ae3019b59117b40a96c3 SHA-256: 388a9598a4da233cc02245a38981c126d4d3e7bcee6e4459cf2b30867fd71d20
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 0.9964

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://seumenha.ru/strik?utm_term=the+outsiders+book+pdf+chapter+4 PDF link annotation
    • https://nagaleburanab.weebly.com/uploads/1/3/4/3/134379557/6833224.pdfIn PDF document text
    • https://sitobewabaxepok.weebly.com/uploads/1/3/5/2/135295681/1b62bc340b4633.pdfIn PDF document text
    • https://fapifejoj.weebly.com/uploads/1/3/4/2/134265577/wejexodowuxogusa.pdfIn PDF document text
    • https://vazaratel.weebly.com/uploads/1/3/4/0/134017227/delozidipumumow_bomavewu_dufuvepigopo_vilipug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467927/normal_605011e27edc9.pdfIn PDF document text
    • https://gebifafotuzuwi.weebly.com/uploads/1/3/5/3/135324040/4946609.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/8dbed03c6e95.pdfIn PDF document text
    • https://debimagobu.weebly.com/uploads/1/3/1/6/131637583/xofitiwupadojepunibo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446036/normal_5fd0fdd90b749.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467274/normal_6007cbeb63992.pdfIn PDF document text
    • https://tezogikezuvar.weebly.com/uploads/1/3/4/5/134584113/zagajepasadodabusole.pdfIn PDF document text
    • https://rabidibizuzej.weebly.com/uploads/1/3/4/6/134648686/9b77a4d7723d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_604631d67bddc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377407/normal_6015bbc8f291c.pdfIn PDF document text
    • https://padubutidosose.weebly.com/uploads/1/3/3/9/133997835/8915434.pdfIn PDF document text
    • https://rutesusu.weebly.com/uploads/1/3/0/7/130776221/soxopedo.pdfIn PDF document text
    • https://mowibusox.weebly.com/uploads/1/3/4/5/134591082/8554108.pdfIn PDF document text
    • https://kujuxase.weebly.com/uploads/1/3/4/5/134584075/neleposadarakade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471488/normal_605becbfd45bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365642/normal_5fcf49cf0cb32.pdfIn PDF document text
    • https://fezagexagowib.weebly.com/uploads/1/3/5/3/135313062/88c9eb002a31bea.pdfIn PDF document text
    • https://revabusabozuvum.weebly.com/uploads/1/3/5/3/135398016/8a94c754.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454671/normal_5ffe687dda2bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425483/normal_600793b09b9da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e5e1aa7-f69c-4bec-b3e1-14f07ae05780/diana_her_true_story_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a3de581-b93f-4ecf-b710-931c34ccf2da/50512862425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f443adc-62ed-4620-aec3-4eaacaa583e3/microsoft_visual_basic_2015_textbook.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 5452 bytes
SHA-256: 75c0f277c5f1cf91505d8e3a8dc23f8463768802d2ddc8e2cf181a01057f2b63
font_01_sfnt_off00010944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10944 10400 bytes
SHA-256: eb220ea6d13ee3efa1d430bf45a583c754b12b06eda3f4b8a96fd9cc0499ca13