Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf670dd0477370c7…

MALICIOUS

PDF

81.7 KB Created: 2021-02-22 13:55:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 35bbb90dbc8a9480ed0a7ea30d9e8b93 SHA-1: c2a9ad1c17ec7ce0ea2feab89d363bb0377b7b86 SHA-256: bf670dd0477370c742630a9123e9357d7f57da0926d457614e0a7c98c02968be
126 Risk Score

Malware Insights

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

The PDF document contains multiple external URIs, including one that appears to be a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=jack+lalanne+power+juicer+mt+1000+reviews PDF link annotation
    • https://cdn.sqhk.co/jibenapola/riachiB/full_screen_sad_whatsapp_status_video_download_mp4.pdfIn PDF document text
    • http://prod-fruit.space/the_american_rattlesnake_cartoondwh53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385197/normal_6014bcc085335.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/iVjimgi/jurassic_dinosaur_transport_off_road_truck.pdfIn PDF document text
    • https://cdn.sqhk.co/xezafube/1ghMHCQ/candle_volume_chart_tradingview.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367921/normal_6008d4e136fd6.pdfIn PDF document text
    • http://verification-help.com/fezojufvelwv.pdfIn PDF document text
    • http://7lessons.site/amharic_proverbs_with_meaningsfy033.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383912/normal_6001112aa2b8d.pdfIn PDF document text
    • https://cdn.sqhk.co/rojopuvukit/fib51gQ/77179602152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449793/normal_601cc994507de.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
    • https://s3.amazonaws.com/xopugup/67518151710.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/xejegiwimusagijinu.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/daily_planner_template_for_onenote.pdfIn PDF document text
    • http://bejutamukedus.epizy.com/nuvaga.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/mewukebabakulu.pdfIn PDF document text
    • http://naximeb.rf.gd/tebutawalonegavali.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/free_top_music_ringtones.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/mevufurureku.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 5436 bytes
SHA-256: 9db7678e1f21f060353790ad3c54098c8633071c63d093c886ec3067523c599c
font_01_sfnt_off0000fe5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000106e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 10508 bytes
SHA-256: 5e2dc0983d629dc2191c83f6dc45e6b565455e3ee83d8e335238a6939791ac07
font_03_sfnt_off00012acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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