Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80b540e7769141f…

MALICIOUS

PDF

74.2 KB Created: 2021-06-05 21:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d9acefbfb214a86a56baa7b58f2c62ca SHA-1: 123c7885c01d93bbc7dbe838e720be4d71b9430c SHA-256: f80b540e7769141f7faae0eb477415f4174079004bd7af2dcf27692edef5cc71
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics as malicious, including a specific ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to poetry, directing users to a suspicious URL. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://synerhu.ru/pbw?utm_term=how+to+put+rhythm+in+a+poem PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381738/normal_5ffcbb83647c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_6036e3084b731.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479707/normal_6022d7af509e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489251/normal_6041d6bad9cc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450240/normal_5fceda57da843.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373768/normal_6067a5f7b6b0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_6039dbc634d00.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/5bbc28c9-d9a8-4240-a8be-603ea2c30ba0/http_error_response_code_417.pdfIn PDF document text
    • http://kefimazusob.pbworks.com/f/vowukigik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d144bd9a-81b0-4167-84b3-c451216767fa/toyota_rav4_fuel_mileage_2010.pdfIn PDF document text
    • http://molosafokaji.pbworks.com/f/gugaran.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e54ca813-cc7b-48c3-ba43-22cd9a2b79b5/melhor_dieta_para_perder_barriga.pdfIn PDF document text
    • http://rixepal.pbworks.com/f/coaxial_cable_wire_gauge.pdfIn PDF document text
    • http://jobojifitin.pbworks.com/w/file/fetch/144454941/shiva_tandava_stotram_in_kannada.pdfIn PDF document text
    • http://gozuwef.pbworks.com/f/juladelikidujuwepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df01ba32-7fa1-4c1b-a7f0-e2c4afae790f/construction_safety_jobs_in_san_antonio_texas.pdfIn PDF document text
    • http://faxamom.pbworks.com/w/file/fetch/144473418/rafael_orozco_novela_completa_capitulo_22.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7352277e-02c4-4d92-9bae-a8e2ad71ec1f/vumesopuvuzuvugevadat.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_off0000e569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE569 5004 bytes
SHA-256: 425b6a4a919a50974e82e13e53a41c76a091d63f6d99a2cdc5448f5db0ff9537
font_01_sfnt_off0000f653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 10868 bytes
SHA-256: 74922c262457ea71800d83b2daa105c6d73821961821efcc9884c6341ce9ae56

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