Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db7a7cdc7f23c00…

MALICIOUS

PDF

81.0 KB Created: 2021-03-17 20:47:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 85e34363ce119c1c6220c8ed186a0bfe SHA-1: df8d9d843905f3ae029a3c968a390e01ccc3194d SHA-256: 0db7a7cdc7f23c00bc23f81eb783cc2d8c460c854f865621a7c7defa0695f7fd
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 0.9995

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=fender+fuse+mac+big+sur PDF link annotation
    • https://lurafavef.weebly.com/uploads/1/3/0/8/130813461/c267c77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426551/normal_5fce4d8e84fd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500186/normal_60308d24c7102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381102/normal_60267721efb97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481841/normal_5ffe8a23b621e.pdfIn PDF document text
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/6967224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417214/normal_6030701a50cae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muxegeza/real_time_traffic_report_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/archeologia_romana.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/xobewatelifok.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_79ce804c5dfa4919a17cb6e985ded42f.pdf?index=trueIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_2fba843670aa4becae6836d0f3e32af0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/how_to_become_a_dentist_in_india.pdfIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_dfc46ad4be4441aa8a51c42638d6486f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/waduzirader/tamifenadik.pdfIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_c0fd9af5fe7b48308a64280fa5f9992a.pdf?index=trueIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_2f9c96b00841411b900c6cd41fffab32.pdf?index=trueIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_9d2bc010e0604f53aa74a39c791b6734.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_a9fce6ef364e43049407b860f4031194.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_2d43df11b03949e29e2b284b58371446.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remavuj/how_to_play_fantasy_basketball_categories.pdfIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_6e0700d9cb694384a80b107f46947d9f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 5404 bytes
SHA-256: 80f439a97fd8ace6ff916a4773e2a67b7f3ce0f9444c59147a074c33adfe74c5
font_01_sfnt_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off00010cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 12188 bytes
SHA-256: 6e0c5468615a11da17fd95605a4bd55db6c90dca642dcee1afa175c44cbefe4e