Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fc0cf0c1054901…

MALICIOUS

PDF

71.5 KB Created: 2021-02-25 14:33:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4ab204a8ca0f00c7d5434663d731fefd SHA-1: dfac9c5513ff622028fc52bf56a0cc401f7415fe SHA-256: b8fc0cf0c1054901a6357a7a9657a6c725ab63b1485a21e6ac3e40122b7291a3
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://crophysi.ru/123?utm_term=replace+dryer+plug+for+outlet PDF link annotation
    • https://vujexuxifu.weebly.com/uploads/1/3/0/7/130739824/fegiwekulada_nuxaje_jedisimivipeb_rajokirupet.pdfIn PDF document text
    • https://dojunulopifo.weebly.com/uploads/1/3/4/4/134445836/jenoxebem.pdfIn PDF document text
    • http://jusuzabajalaz.22web.org/what_is_syllable_and_its_types.pdfIn PDF document text
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/29658.pdfIn PDF document text
    • https://gosupafitowiru.weebly.com/uploads/1/3/4/6/134673249/1670186.pdfIn PDF document text
    • http://xinumazujo.iblogger.org/crystal_report_developer_for_visual_studio_2019.pdfIn PDF document text
    • https://gomosonu.weebly.com/uploads/1/3/2/7/132712120/6201548.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/gufovudabawewotudozawen.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/does_bodyboss_really_work.pdfIn PDF document text
    • https://fofirajajamide.weebly.com/uploads/1/3/4/6/134643930/8071dde.pdfIn PDF document text
    • https://xatiletovolut.weebly.com/uploads/1/3/1/4/131409128/c336df7db4.pdfIn PDF document text
    • https://wabezapodila.weebly.com/uploads/1/3/1/4/131437306/9cd6a2b29d4cbc.pdfIn PDF document text
    • https://jafipununevov.weebly.com/uploads/1/3/0/8/130814040/medovam_gerazovoj_rufajoderavofi_vegulegekavewuk.pdfIn PDF document text
    • http://simomezubuxo.22web.org/kerog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wetovokerug.epizy.com/bethany_hamilton_book.pdfIn PDF document text
    • http://faxunarin.epizy.com/texas_aggie_war_hymn_sheet_music.pdfIn PDF document text
    • http://lezezukoxe.epizy.com/boca_river_madrid_formaciones.pdfIn PDF document text
    • http://nozaleb.rf.gd/wegixinadek.pdfIn PDF document text
    • http://biwexasen.rf.gd/davokesowupinoxa.pdfIn PDF document text
    • http://zowabito.rf.gd/93955136676.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/how_to_use_the_ti_30x_iis_for_algebra.pdfIn PDF document text
    • http://lumigetutiburu.epizy.com/dmv_change_of_address_form_online.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ced6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED6 4984 bytes
SHA-256: 95936c48220d9206073f5e2e56c8f9c2a52a5f005b4c2c4fa614ff3806aea884
font_01_sfnt_off0000dfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 10148 bytes
SHA-256: 0b6976bce783448988a38321ca94f6a8fdc3d874ec44d6c448d10358dcc28774
font_02_sfnt_off00010299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10299 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378