Malicious PDF — malware analysis report

Static analysis result for SHA-256 a112a1c3f668de35…

MALICIOUS

PDF

85.4 KB Created: 2021-03-18 15:38:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b15d4a8e06b847bde31b0e195642c201 SHA-1: d958e0537da6a157727b60e718ffdeb1baeb2617 SHA-256: a112a1c3f668de351dd6f46c60cf921cc075e77d36155af349385f70b0afc222
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 0.9970

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://dafemum.ru/wix?keyword=integrative+manual+therapy+certification PDF link annotation
    • http://ramuwazezu.22web.org/kowotezuberitaputid.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/jciagca/metigefetovelumit.pdfIn PDF document text
    • https://cdn.sqhk.co/rojawamusula/JK3gdjj/action_truck_accessories_grande_prairie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_6051997cceb28.pdfIn PDF document text
    • https://cdn.sqhk.co/modesarox/fvTqjfI/learn_to_play_piano_online_free_interactive.pdfIn PDF document text
    • https://cdn.sqhk.co/ragonujip/je7ffe9/55129709819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487381/normal_601f29ad24a39.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/xidUivk/59618501428.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/iiRgijQ/tor_browser_iphone_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/hhjafMa/naval_war_movies_on_netflix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384036/normal_60414bd94d34c.pdfIn PDF document text
    • https://cdn.sqhk.co/lagidexetin/4gcqhU6/online_business_ideas_for_kids.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/M1hfjim/electric_meter_units_to_kwh_calculator.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tubofebagadupa.epizy.com/isometric_drawing_exercises_with_dimensions.pdfIn PDF document text
    • http://fojiresov.epizy.com/marvel_encyclopedia_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/edexcel_gcse_spanish_textbook_answers.pdfIn PDF document text
    • http://zukusuvajijip.epizy.com/mapa_bologna.pdfIn PDF document text
    • http://sobuzazan.rf.gd/86465589849.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_f2716ef7a70f48ef93c6177bed55a669.pdf?index=trueIn PDF document text
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_91db2e864fd547d7baebb2d8cce7e589.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/65581652393.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/automatic_transmission_repair_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/fabaduzawenisonepesabudis.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/hazard_identification_tool_template.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_ba35b218cb694c4a807cb34f0defebad.pdf?index=trueIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_dd75dda1affc4293b1cf9b8c7d192402.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C25 5348 bytes
SHA-256: 3b9d2f35b044766e29cfc60e0bda12dbfa63124bc839cc5b3145405198df9be4
font_01_sfnt_off00011e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E46 11612 bytes
SHA-256: cdd70bdef1330dd1b79b3f885cdb18eec42d42641076c5056c16277c96960242