Malicious PDF — malware analysis report

Static analysis result for SHA-256 428f3fc8d1914c01…

MALICIOUS

PDF

75.9 KB Created: 2021-03-25 12:56:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4c7a19f2513785435f873e198e2f5839 SHA-1: 21655707d86293dbc0758a7545911ed54d892720 SHA-256: 428f3fc8d1914c0194b78385f59abe67837d9ebb359e429736ccb5a964be60b5
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm hosted on disposable domains, with one primary URL being https://jumiwimov.ru/strik. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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/strik?utm_term=how+much+can+a+2011+ford+ranger+v6+tow PDF link annotation
    • http://xizadewakali.iblogger.org/gazetted_officer_form_for_pan.pdfIn PDF document text
    • http://vugivanasidej.22web.org/calculus_early_transcendentals_functions_4th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387819/normal_605ad7358003f.pdfIn PDF document text
    • http://kernig.pro/fatinoxfp5.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/forces_1d_phetmf67v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478716/normal_602bf32768c10.pdfIn PDF document text
    • http://nuwetiveguvo.mypressonline.com/bsc_magazine_august_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490930/normal_6003ab1ced709.pdfIn PDF document text
    • http://yesstore.pro/how_does_the_bose_wave_music_system_workcdqag.pdfIn PDF document text
    • http://kimujedat.mygamesonline.org/crossword_puzzles_for_kids.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479675/normal_5ff9a639edeef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://beregetam.epizy.com/juminekor.pdfIn PDF document text
    • http://kemubozureta.epizy.com/60418854254.pdfIn PDF document text
    • http://vesedakowata.onlinewebshop.net/bash_shell_commands.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba394f1c-f776-4a5f-b792-6efcdba2c13a/love_story_lyrics_indila_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d88b744-4a19-4223-8105-a264ec681891/nobizatoronaxisonegiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23fba189-34fe-4a5f-ac45-123023afcab5/81076788230.pdfIn PDF document text
    • http://vulewibof.epizy.com/76964091011.pdfIn PDF document text
    • http://vorasatijede.rf.gd/cancer_de_mama_segun_oms.pdfIn PDF document text
    • http://muxopuwe.epizy.com/zilovepigovigodaramafet.pdfIn PDF document text
    • http://kutuwawelozekot.rf.gd/basswood_sheets_3_16.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_off0000eb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 5820 bytes
SHA-256: 59c16122134af3ff4096101de8dcb055657b925190aeff67a31590049018994b
font_01_sfnt_off0000fef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 10212 bytes
SHA-256: e91dc35cd0aee4455eb8f4c450e8048294c7b72377a69f9afc0d29843699e228

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