Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fd9215779c76fe…

MALICIOUS

PDF

78.2 KB Created: 2021-03-22 14:38:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8e4dbc61df1bac21a48c4add80bb1568 SHA-1: 9453a2e42d307fc97b66edbec63f68a369c49602 SHA-256: 21fd9215779c76feb91a6472753d8c2025edd69151dcc0b68658fdda13b025ba
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of 'utm_term' parameters in some URLs indicates a phishing or tracking attempt, likely to disguise the true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/aws?utm_term=wedding+text+png+free+download PDF link annotation
    • http://helpcenterbusiness.xyz/doxelavizifutifibamaeqvpz.pdfIn PDF document text
    • http://heliusdesign.ru/my_kenmore_elite_he3_dryer_will_not_starthxffb.pdfIn PDF document text
    • http://fijexojor.getenjoyment.net/ap_grama_sachivalayam_books.pdfIn PDF document text
    • https://cdn.sqhk.co/widexerun/0Yjj2nr/desizifuf.pdfIn PDF document text
    • http://rubyshup.space/barcode_scanner_price_appccee4.pdfIn PDF document text
    • http://dronextactical.xyz/relic_runner_mtg6gbtg.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/delegation_of_financial_power_rules_2020.pdfIn PDF document text
    • https://mowewudogib.weebly.com/uploads/1/3/5/3/135310369/bofow.pdfIn PDF document text
    • http://zesaguzijor.mypressonline.com/15998996716.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/pgdHgdv/energo_team_spin_blade_elite_10-_30.pdfIn PDF document text
    • http://mesretly.xyz/4598484273l1pm0.pdfIn PDF document text
    • http://govuled.mywebcommunity.org/86299500466.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxegaxujifo/XgfgjUZ/posape.pdfIn PDF document text
    • https://lonexababite.weebly.com/uploads/1/3/1/1/131163854/ea0caf4f5e.pdfIn PDF document text
    • https://bozelisu.weebly.com/uploads/1/3/2/6/132695328/kubup.pdfIn PDF document text
    • https://cdn.sqhk.co/gomurabog/jghhche/3526566637.pdfIn PDF document text
    • https://tefeteti.weebly.com/uploads/1/3/0/9/130969297/zamew.pdfIn PDF document text
    • https://cdn.sqhk.co/narulaloro/b1LOgh1/deals_offers_shops_brands_sales_daily_deals.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/budubobikedatow.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/97930516781.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/31785263731.pdfIn PDF document text
    • http://jukasuxoseki.atwebpages.com/wordly_wise_3000_book_8_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/pdf_highlighter_app_android.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_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 5204 bytes
SHA-256: a3edbbdca5a2073f5a84bdcec11e2e35f1c437362feb6e2e2a22751bf54945a4
font_01_sfnt_off00010a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 9560 bytes
SHA-256: 72a35a4697ba40a82843c3793e7583663b3a4fefd87595adc36cda4ec6cdfc6d

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