Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e533c5755ae4ea3…

MALICIOUS

PDF

76.6 KB Created: 2021-05-31 17:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c2f1b31fe6d598ab34e4fb5ece99fcc8 SHA-1: d6b4bc5b066f29e67745e6fe5f01302e3b99808c SHA-256: 9e533c5755ae4ea39d3adb87d95883cd1fd50e8cf6033027e24678e19378e71d
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 0.9997

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://jumiwimov.ru/123?utm_term=music+video+treatment+template+pdf PDF link annotation
    • https://jokazetesolibut.weebly.com/uploads/1/3/5/3/135314514/lufupuduril_lowode_gexotegesakel.pdfIn PDF document text
    • https://topuzuxet.weebly.com/uploads/1/3/0/7/130739133/5768378.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367951/normal_6001b7cf32145.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407331/normal_5fcaa78f29e0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476595/normal_5fee10f578c70.pdfIn PDF document text
    • https://xulozajewe.weebly.com/uploads/1/3/1/3/131384688/viluvuj-lulijupow-tolikado-gapuwegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371240/normal_6048f2961b2b6.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4366408/normal_60b2a8afa5d40.pdfIn PDF document text
    • https://rozogefeju.weebly.com/uploads/1/3/1/3/131398259/67fcd526dfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451744/normal_6045eef681bf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474445/normal_5fe593f382dee.pdfIn PDF document text
    • https://divopugizupuja.weebly.com/uploads/1/3/4/4/134487222/norusawosodaxur.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/01901f96-49e5-496f-80c1-ba86e469f881/poxaxisuw.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/f/52100404785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/002f2334-d47e-4bd9-9030-76001ed8e31c/celos_asesinos_2018_pelicula_completa_en_espaol_latino_online_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51b9792a-c3a4-400a-8c28-3b09e9ecbce5/xutaw.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144412494/python_programming_darshan_download.pdfIn PDF document text
    • http://supatibu.pbworks.com/f/short_stories_based_on_thirukkural_in_tamil.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144412251/reversionary_life_estate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/909a4b12-e019-4d5b-8e17-0b7c8865790f/keune_semi_color_how_to_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11bc2276-314d-45e0-8732-9e5b9fca4db1/64878434873.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_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 5368 bytes
SHA-256: 988ff5fdab28aa5d740dcfbee358dc49b9624fc6f51ce593f093f46c532c21b0
font_01_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 10544 bytes
SHA-256: 5014150ed5d87b47543f1de003434b06cd8eb617649748269604ea287327d9ce