Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f68d7a6ca9fb62…

MALICIOUS

PDF

71.5 KB Created: 2021-02-18 06:53:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8cf7d6eeb0c0d45ae6baa873bd7ec948 SHA-1: dfce7f06cc7cfca2e7db85ab91586586193a7fae SHA-256: f1f68d7a6ca9fb620cb9c310c03b5bb7aeaba35711e62c93096d36af592711af
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to search queries, reinforcing the lure to external sites.

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/wb?keyword=la%20sombra%20del%20viento%20english%20pdf PDF link annotation
    • http://metazoaapc.fun/what_does_economic_freedom_mean_to_youpjxtk.pdfIn PDF document text
    • http://zekabivalejasaj.22web.org/put_sheets_in_alphabetical_order_excel.pdfIn PDF document text
    • https://sixuvowapunara.weebly.com/uploads/1/3/0/7/130738553/widiwuko-sebebuwuk-gekudelagi-fajutisusodogi.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzexesetaba/iLMgiCA/mp3_player_music_app.pdfIn PDF document text
    • http://opit.space/lunutawirudaralividutqwher.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466689/normal_5ffde088863e4.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/ggjjjjA/34028764715.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/rihTggd/muvuvumusutewejej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sevezogare.rf.gd/free_id_card_template_excel.pdfIn PDF document text
    • http://fikirifulok.epizy.com/28904484775.pdfIn PDF document text
    • http://vumopigaw.epizy.com/cydia_without_jailbreak_ios_11.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_off0000dacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACD 5596 bytes
SHA-256: 78b91648fafb1269b14aedf95baa9706668fc4a5bbb603cf8f77fd6b97624c7b
font_01_sfnt_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 10876 bytes
SHA-256: 55882a9a95b7aa1c5eea643369b576b741f993417a07d40e8c4ebc4d727b5853

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