Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79f6c5cddd49846…

MALICIOUS

PDF

77.3 KB Created: 2021-04-29 18:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 47d3fede659da02b8eb7f8d2bbca69c8 SHA-1: 4b225c8a33942a83f27be14f9eef45d524c61ee5 SHA-256: f79f6c5cddd4984678b00ae6a52781c2fb1cc3bee1555c56df6484347d15d3d4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. Heuristics indicate it's a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=before+you+say+i+do+workbook+pdf PDF link annotation
    • http://bluhgang.best/how_to_use_descriptive_writing7wj3c.pdfIn PDF document text
    • http://wofefudolojet.mywebcommunity.org/riscos_ocupacionais.pdfIn PDF document text
    • http://dfds.in/ukulele_club_of_santa_cruz_songbook_2hw112.pdfIn PDF document text
    • http://mxbur.fun/xenogudola0dky6.pdfIn PDF document text
    • http://sk-anker.ru/summary_of_marking_period_3_in_speakd4ux6.pdfIn PDF document text
    • http://aycotoro5.xyz/837906247755lxh6.pdfIn PDF document text
    • http://tilikef.mygamesonline.org/bhaktamar_stotra_mantra.pdfIn PDF document text
    • https://cdn.sqhk.co/kufejeni/jijJYha/lopaxumuw.pdfIn PDF document text
    • http://kinoogf.space/15190870017luui6.pdfIn PDF document text
    • http://otshelnik.net/xebudigeqrrr3.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/Suiiqii/43339080865.pdfIn PDF document text
    • http://springital.fun/dinosaur_rampage_mod_apk_money94ssf.pdfIn PDF document text
    • http://trynutra.shop/513430048ucyo8.pdfIn PDF document text
    • http://kejurudoji.medianewsonline.com/tabla_de_derivadas_e_integrales.pdfIn PDF document text
    • https://cdn.sqhk.co/wubofuse/icjgjhi/last_arrow_mod_apk_unlimited_money.pdfIn PDF document text
    • http://usechambre.xyz/mitsubishi_electric_mr_slim_filter_cleaningvi39c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd52887-1a16-44cd-aed8-9f5e9cfc1602/what_is_constructionist_approach.pdfIn PDF document text
    • http://tipokeviti.atwebpages.com/introduction_to_virtue_ethics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/def051de-c050-4c42-b0ce-0580ba033c57/speak_without_fear_book_review.pdfIn PDF document text
    • http://larovitivejel.atwebpages.com/15786364478.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_off0000f01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01A 5452 bytes
SHA-256: 30ba09c85a40da3c08e62d48ef3308c2602ce1aefc36e792dae41fceb4161cf7
font_01_sfnt_off000102d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 11036 bytes
SHA-256: b9c2c8b9a0ad29b168625c4c33f2d7a3619cba47426cc7ee6408007377d6d78e

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