Malicious PDF — malware analysis report

Static analysis result for SHA-256 5471e9d7585fcee2…

MALICIOUS

PDF

69.3 KB Created: 2021-03-05 23:34:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 735354cd9ece81b582330f15a290ee45 SHA-1: 7228b96544046cda9b0b355c1deacd81261c5b56 SHA-256: 5471e9d7585fcee28203b06f54539fb35c047bdd081febca42886321a2d507bf
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, suggests a lure related to 'Kenmore elite washer instructions'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/strik?utm_term=kenmore+elite+washer+instructions In PDF document text
    • http://fozakewugumomig.22web.org/31697063074.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475204/normal_6037571aa795b.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/94243225097.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/25463896143.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423454/normal_5ff024e569f8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451225/normal_5fc7c3d8199aa.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/direluvalitetipikot.pdfIn PDF document text
    • http://majulevo.22web.org/saxilodupi.pdfIn PDF document text
    • http://ponipekerewex.22web.org/98829133398.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/nusigiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421366/normal_6038fc4461d3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498893/normal_5ffa6a4186b31.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/29216800178.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://deriwabip.epizy.com/journal_of_magnetic_resonance_imaging_author_guidelines.pdfIn PDF document text
    • http://delonewafunedi.rf.gd/how_to_calculate_ending_inventory.pdfIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_396075b08f49491a9fa1c3a9e062e081.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mukut/16751625158.pdfIn PDF document text
    • http://zuzidonul.epizy.com/implosion_apk_mod.pdfIn PDF document text
    • http://guganukipajaxi.rf.gd/gugajav.pdfIn PDF document text
    • http://jigufabusu.epizy.com/3d_video_editor_apk.pdfIn PDF document text
    • http://jasopiwutuv.epizy.com/how_to_make_a_simple_puppet_with_paper.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_c814b09e916b43349273b8095ee6de31.pdf?index=trueIn PDF document text
    • http://zomekijisev.rf.gd/aspiracion_de_secreciones_nasofaringeas_y_orofaringeas.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/rocket_league_cross_platform_steam_xbox.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_off0000d341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD341 5100 bytes
SHA-256: 4821db2e3185ec4f8a14fcf1711eb7611ba4c194af889782e105657722c2f39d
font_01_sfnt_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 10388 bytes
SHA-256: da52678d77be62769e56b0c9226aa5bbe9770bdfdeb2e5177fb10ef4021d126a

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