Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f72d8fe238c9b67…

MALICIOUS

PDF

73.2 KB Created: 2021-05-18 23:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4a5cbb32aa89f51834fd14c7e68aad61 SHA-1: 20dbd2b3dde8dabc4f52b844eccee2d288247ada SHA-256: 5f72d8fe238c9b67921335b239d6c3d2bb6904f3ffe88d6eb82aff33ffe24d31
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/strik?utm_term=aquasource+tub+and+shower+faucet+parts PDF link annotation
    • https://muvomajivogi.weebly.com/uploads/1/3/4/3/134373377/1419020.pdfIn PDF document text
    • https://gokasesebigi.weebly.com/uploads/1/3/3/9/133986942/fizumelanajopit_gokedeki.pdfIn PDF document text
    • https://delidenaluno.weebly.com/uploads/1/3/4/4/134438050/sevitidag.pdfIn PDF document text
    • https://wodirukuz.weebly.com/uploads/1/3/5/3/135398055/rozidomu.pdfIn PDF document text
    • https://vomizovuzib.weebly.com/uploads/1/3/1/6/131637161/3404891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467017/normal_5fd868ece0f10.pdfIn PDF document text
    • https://xediziku.weebly.com/uploads/1/3/1/3/131384396/8394824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527357/normal_5fd1f876f2abc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465935/normal_60008bec305b8.pdfIn PDF document text
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/7249926.pdfIn PDF document text
    • https://kuvezuwuziteb.weebly.com/uploads/1/3/4/3/134388010/rewumokutaxab_xewegenulaxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417045/normal_5feb9363738f1.pdfIn PDF document text
    • https://rapowude.weebly.com/uploads/1/3/1/4/131454581/7784742.pdfIn PDF document text
    • https://nodekisoguzila.weebly.com/uploads/1/3/5/3/135313862/a1beb89a14f1c22.pdfIn PDF document text
    • https://libufuvebugun.weebly.com/uploads/1/3/1/4/131406816/rimepemusedaw-wemuwij.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/f201c6c6-6200-4aba-8847-f3e00867fe89/burger_king_impossible_whopper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16096674-d84e-4965-8910-14d5739cdf05/how_to_use_sony_camera_as_webcam_for_zoom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15d89f95-61c8-4eb5-9455-c0790472bd39/tica_para_amador_resumen_captulo_1_al_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b9f8eaf-f572-44a7-b1fa-7b6f8980587b/how_much_power_steering_fluid_honda_civic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd0df47c-ac92-4c6d-97b9-2bc35909af69/cooks_essentials_electric_pressure_cooker_recipe_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/916d5530-9215-49eb-8cbd-334ddf1253c9/limites_al_infinito_ejercicios_resueltos_con_graficas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b51d30-9357-4d5d-87c8-610cbd0ac1b7/35144812505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1faafbaf-fa68-4e77-bd45-08bfcb52655b/47888552145.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_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 5556 bytes
SHA-256: 3e98c408a92b3538b4e75eb7c5b29fbd2c3ade6a5ef0b2729f43869dc6b0dc0f
font_01_sfnt_off0000f2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 10824 bytes
SHA-256: aaf59aca839c9bfeb6f853f203cbfb69b49cd58ce4c078b66e50d0e8231e5d37