Malicious PDF — malware analysis report

Static analysis result for SHA-256 5949c2d2e0bc2498…

MALICIOUS

PDF

83.4 KB Created: 2021-02-26 01:27:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d25c4f173259433d9b76d2d5f867d55c SHA-1: 325ebc9f747776f654849f85f8b6bdb5b03cb84b SHA-256: 5949c2d2e0bc2498cac8289ed7368d93d7bae9720b0eda377dcaacd5d53c137e
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards the document facilitating access to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=how+do+you+teach+conflict+resolution+to+preschoolers PDF link annotation
    • http://roskycnmx.com/modelo_relacional_base_datos_ejemplos_resueltoszd89j.pdfIn PDF document text
    • http://in-step.shop/how_to_build_scale_model_carso2xt6.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/99865251935.pdfIn PDF document text
    • http://sfr-webmail.com/mugolukoduvuxufenizu2akq5.pdfIn PDF document text
    • http://jevafurevozu.mygamesonline.org/vevaf.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/nikisaxigewikarikosinive.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/56443163732.pdfIn PDF document text
    • http://my-favshopc.online/weketezilomipuvazawejavmku.pdfIn PDF document text
    • http://fb-ig-copyright.com/impossible_game_answers_42tuiz6.pdfIn PDF document text
    • http://ributufukepun.66ghz.com/44990394913.pdfIn PDF document text
    • http://amorexpo.com/html_css_javascript_interview_questionsf7ali.pdfIn PDF document text
    • http://yogait.space/6175273789wp2k5.pdfIn PDF document text
    • http://mainsale.info/muvubxl1yp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zesafemumibow.myartsonline.com/damituzerodekamaxo.pdfIn PDF document text
    • http://sedopati.epizy.com/hiperbaton_figura_literaria_definicion_y_ejemplos.pdfIn PDF document text
    • http://vubixijugisoloz.epizy.com/91899979257.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_off00010810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 5396 bytes
SHA-256: 5bf69969cd432b5ffa3ac2427fb24e3ff63e0767447f6826926ae086a1f4c62d
font_01_sfnt_off00011a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A81 11008 bytes
SHA-256: 7284aa75ac74eead2224281c20ae85ba249d31dd9a09608aa5cff12e6f600631

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